Thread:Project:Support desk/Extension Search Help/reply (2)

You can do a diff between two revisions of a page, but also between revisions of different pages, although there's no user interface for this.

You can click on a diff link in a page history. The URL should end in something like &diff=XXXXX&oldid=YYYYY. Changing XXXXX and YYYYY with two arbitrary revision id's even of different pages will produce a diff between them.

Of course, that requires you manually doing the comparision, there's nothing to just do a search for pages that are the same.