Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 4494)
+++ /CKEditor/trunk/CHANGES.html	(revision 4495)
@@ -62,4 +62,5 @@
 		<li><a href="http://dev.fckeditor.net/ticket/4542">#4542</a> : Fixed unable to access buttons using tab key in Safari and Opera.</li>
 		<li><a href="http://dev.fckeditor.net/ticket/4577">#4577</a> : Fixed relative link url is broken after opening 'Link' dialog.</li>
+		<li><a href="http://dev.fckeditor.net/ticket/4597">#4597</a> : Fixed custom style with same attribute name but different attribute value doesn't work.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/core/dom/element.js
===================================================================
--- /CKEditor/trunk/_source/core/dom/element.js	(revision 4494)
+++ /CKEditor/trunk/_source/core/dom/element.js	(revision 4495)
@@ -723,6 +723,6 @@
 				{
 					attribute = otherAttribs[ i ];
-
-					if ( ( !CKEDITOR.env.ie || ( attribute.specified && attribute.nodeName != '_cke_expando' ) ) && attribute.nodeValue != thisAttribs.getAttribute( attribute.nodeName ) )
+					if ( attribute.specified && attribute.nodeName != '_cke_expando'
+							&& attribute.nodeValue != this.getAttribute( attribute.nodeName ) )
 						return false;
 				}