diff --git a/app/resources/locales/en_US/default.po b/app/resources/locales/en_US/default.po
index fc2416610..68cf0efc5 100644
--- a/app/resources/locales/en_US/default.po
+++ b/app/resources/locales/en_US/default.po
@@ -590,6 +590,18 @@ msgstr "Filter"
 msgid "match.op.go"
 msgstr "Go"
 
+msgid "match.op.highlight"
+msgstr "Highlight:"
+
+msgid "match.op.highlight.both"
+msgstr "both"
+
+msgid "match.op.highlight.differences"
+msgstr "differences"
+
+msgid "match.op.highlight.matches"
+msgstr "matches"
+
 msgid "match.op.last"
 msgstr "Last"
 
diff --git a/app/templates/Matchgrids/reconcile.php b/app/templates/Matchgrids/reconcile.php
index c701c5305..589cb984e 100644
--- a/app/templates/Matchgrids/reconcile.php
+++ b/app/templates/Matchgrids/reconcile.php
@@ -29,25 +29,40 @@
 
   use \App\Lib\Util\ArrayUtil;
 
-  // extract the attribute field names into a simple array
+  // Ensure that the candidates array is sorted by referenceid so we can easily match up identical adjacent referenceids.
+  // Note that this will retain the "New" record in first position (because the referenceid is empty).
+  array_multisort(array_column($vv_candidates, 'referenceid'), SORT_ASC, $vv_candidates);
+  
+  // Generate the referenceid label output by creating a simple array that contains the unique referenceid values
+  // along with the count of how many occurrences each has in the $vv_candidates structure (for colspan).
+  // Note that we must assign an empty string when encountering a NULL referenceid because array_count_values
+  // can only work on integers or strings.
+  $refIds = array();
+  foreach ($vv_candidates as $candidate) {
+    $refIds[] = !empty($candidate['referenceid']) ? $candidate['referenceid'] : '';
+  }
+  $refIds = array_count_values($refIds);
+  
+  // Extract the attribute field names into a simple array.
   $fieldNames = array();
   foreach ($vv_candidates as $candidate) {
     $fieldNames = array_keys($candidate);
     break;
   }
 
-  // remove "referenceid" - it is given special treatment and should not be included in our structure
+  // Remove "referenceid" from the field names - it is given special treatment and should not be included in our
+  // attributes structure.
   array_splice($fieldNames, array_search('referenceid',$fieldNames), 1);
 
-  // build the data for the candidates into a structure for generating the view:
+  // Build the data for the candidates into a structure for generating the view:
   // attribute field name | attribute values | do the values match?
   $canAttr = array();
   for($i = 0; $i < count($fieldNames); $i++) {
 
-    // put the field name in the first column
+    // Put the field name in the first column.
     $canAttr[$i][0] = $fieldNames[$i];
 
-    // put all the values for the current attribute into the second column
+    // Put all the values for the current attribute into the second column.
     $canAttr[$i][1] = array();
     foreach($vv_candidates as $c) {
       foreach($c as $key => $val) {
@@ -60,8 +75,17 @@
     // Test for content and equality between the row's attribute values and
     // set the third "match?" column to true (1) if non-empty equality found
     $canAttr[$i][2] = !empty($canAttr[$i][1][0]) && count(ArrayUtil::array_iunique($canAttr[$i][1])) === 1 ? 1 : 0;
-
   }
+  
+  // Move request_time and resolution_time to the bottom
+  $tempArr = [];
+  foreach ($canAttr as $key => $val) {
+    if($val[0] == 'request_time' || $val[0] == 'resolution_time') {
+      $tempArr[] = $val;
+      unset($canAttr[$key]);
+    }
+  }
+  $canAttr = array_merge($canAttr, $tempArr);
 ?>
 
 <div class="titleNavContainer">
@@ -69,16 +93,30 @@
     <h1><?= __('match.op.reconcile.requests'); ?></h1>
   </div>
 </div>
-
+<div class="view-controls">
+  <span class="view-controls-title"><?= __('match.op.highlight'); ?></span>
+  <div class="form-check form-check-inline">
+    <input id="view-mode-diff" class="form-check-input" name="view-mode" type="radio" checked> 
+    <label for="view-mode-diff" class="form-check-label"><?= __('match.op.highlight.differences'); ?></label>
+  </div>
+  <div class="form-check form-check-inline">
+    <input id="view-mode-match" class="form-check-input" name="view-mode" type="radio"> 
+    <label for="view-mode-match" class="form-check-label"><?= __('match.op.highlight.matches'); ?></label>
+  </div>
+  <div class="form-check form-check-inline">
+    <input id="view-mode-both" class="form-check-input" name="view-mode" type="radio"> 
+    <label for="view-mode-both" class="form-check-label"><?= __('match.op.highlight.both'); ?></label>
+  </div>  
+</div>
 <div id="reconcile-table-container" class="table-container">
-  <table id="reconcile-table" class="side-by-side">
+  <table id="reconcile-table" class="side-by-side view-mode-diff">
     <thead>
       <tr>
         <td class="empty"></td>
-        <?php $i = 0; // note that we'll skip the first, "new" record. ?>
-        <?php foreach($vv_candidates as $c): ?>
-          <th class="col-names" scope="col">
-            <?= !empty($c['referenceid']) ? __('match.fd.suggestion.a',[$i]) : __('match.fd.new_record'); ?>
+        <?php $i = 0; // used to print the suggestion number in the output. ?>
+        <?php foreach($refIds as $refId => $refIdCount): ?>
+          <th class="col-names" scope="col" colspan="<?= $refIdCount; ?>">
+            <?= !empty($refId) ? __('match.fd.suggestion.a',[$i]) : __('match.fd.new_record'); ?>
             <?php $i++; ?>
           </th>
         <?php endforeach; ?>
@@ -90,9 +128,9 @@
         <th class="attr-title" scope="row">
           <?= __('match.fd.referenceid', [99]); ?>
         </th>
-        <?php foreach($vv_candidates as $c): ?>
-          <td class="reference-ids">
-            <?= !empty($c['referenceid']) ? $c['referenceid'] : __('match.op.new'); ?>
+        <?php foreach($refIds as $refId => $refIdCount): ?>
+          <td class="reference-ids" colspan="<?= $refIdCount; ?>">
+            <?= !empty($refId) ? $refId : __('match.op.new'); ?>
           </td>
         <?php endforeach; ?>
       </tr>
@@ -101,16 +139,16 @@
         <th class="attr-title" scope="row">
           <?= __('match.fd.action'); ?>
         </th>
-        <?php foreach($vv_candidates as $c): ?>
-          <td class="reconcile-actions">
+        <?php foreach($refIds as $refId => $refIdCount): ?>
+          <td class="reconcile-actions" colspan="<?= $refIdCount; ?>">
             <?=
-              $this->Form->postLink(__('match.op.reconcile.' . (!empty($c['referenceid']) ? 'assign' : 'generate')),
+              $this->Form->postLink(__('match.op.reconcile.' . (!empty($refId) ? 'assign' : 'generate')),
                 ['action' => 'reconcile',
                   $vv_cur_mg->id],
                 ['data' => [
                   'rowid' => $vv_request['id'],
                   // Default value needs to be the literal string "new" and not a localized text string
-                  'referenceid' => (!empty($c['referenceid']) ? $c['referenceid'] : 'new')
+                  'referenceid' => (!empty($refId) ? $refId : 'new')
                 ],
                   'confirm' => __('match.op.assign.confirm'),
                   'class'   => 'btn btn-primary nospin']);
@@ -120,12 +158,29 @@
       </tr>
       <!-- All other attributes -->
       <?php for($i = 0; $i < count($canAttr); $i++): ?>
-        <?php $matchClass = $canAttr[$i][2] ? ' class="match"' : ''; ?>
-        <tr<?= $matchClass ?>>
+        <?php
+          $atr = $canAttr[$i][0];
+          // set the row css class
+          // (attribute name + standard, diff, or match)
+          $matchClass = 'matr-' . $atr;
+          if(
+            $atr == 'id' 
+            || $atr == 'sor'
+            || $atr == 'sorid'
+            || $atr == 'request_time'
+            || $atr == 'resolution_time'
+          ) {
+            $matchClass .= ' standard';
+          } else {
+            $matchClass .= ' defined-attr';
+            $matchClass .= ($canAttr[$i][2] ? ' match' : ' diff');
+          }
+        ?>
+        <tr class="<?= $matchClass ?>">
           <th class="attr-title" scope="row"><?= $canAttr[$i][0] ?></th>
           <?php foreach($canAttr[$i][1] as $key => $val): ?>
             <td>
-              <?php if($canAttr[$i][0] == 'id'): ?>
+              <?php if($atr == 'id'): ?>
                 <?= $this->Html->link(
                   $val, 
                   ['controller' => 'matchgrid-records', 
@@ -141,4 +196,14 @@
       <?php endfor; ?>
     </tbody>
   </table>
-</div>
\ No newline at end of file
+</div>
+
+<script>
+  function js_local_onload() {
+    // Handle display-mode switching
+    $('.view-controls input').click(function () {
+      // Remove existing view-mode classes and add the new class equal to the view-controls switch ID
+      $('#reconcile-table').removeClass('view-mode-diff view-mode-match view-mode-both').addClass($(this).attr('id'));
+    });
+  }
+</script>  
\ No newline at end of file
diff --git a/app/webroot/css/co-base.css b/app/webroot/css/co-base.css
index 8c6b8f862..57ab08f60 100644
--- a/app/webroot/css/co-base.css
+++ b/app/webroot/css/co-base.css
@@ -694,9 +694,33 @@ body.logged-in #top-menu {
 #reconcile-table tr:nth-child(2n+1) td {
   background-color: var(--cmg-color-white); 
 }
-#reconcile-table tr.match td {
+#reconcile-table.view-mode-match tr.match td,
+#reconcile-table.view-mode-both tr.match td {
   background-color: var(--cmg-color-green-003);
 }
+#reconcile-table.view-mode-diff tr.diff td,
+#reconcile-table.view-mode-both tr.diff td {
+  background-color: var(--cmg-color-yellow-003);
+}
+#reconcile-table tr.defined-attr th {
+  background-color: var(--cmg-color-lightgray-001);
+  border-left: 4px solid var(--cmg-color-lightgray-007);
+}
+#reconcile-table tr.defined-attr td:last-child {
+  border-right: 2px solid var(--cmg-color-lightgray-007);
+}
+#reconcile-table tr.matr-sorid th,
+#reconcile-table tr.matr-sorid td {
+  border-bottom: 2px solid var(--cmg-color-lightgray-007);
+}
+#reconcile-table tr.matr-request_time th,
+#reconcile-table tr.matr-request_time td {
+  border-top: 2px solid var(--cmg-color-lightgray-007);
+}
+/* view-controls */
+.view-controls-title {
+  margin-right: 1em;
+}
 /* MATCHGRID MANAGEMENT */
 #matchgrid-management {
   padding: 0;
diff --git a/app/webroot/css/co-color.css b/app/webroot/css/co-color.css
index b5243f0a6..a9479ad62 100644
--- a/app/webroot/css/co-color.css
+++ b/app/webroot/css/co-color.css
@@ -63,7 +63,7 @@
 
   --cmg-color-yellow-001: #f5f5bb;    /* yellow warning */
   --cmg-color-yellow-002: #fbec88;    /* infobox informational area */
-  --cmg-color-yellow-003: #ffd;       /* forms: focused input */
+  --cmg-color-yellow-003: #ffd;       /* forms: focused input; diffing fields for reconciliation */
   
   --cmg-color-red-001: #fcc;          /* red warning */
   --cmg-color-red-002: #c00;          /* forms: error icons */