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Enter URLs from World of Logs detail pages. Make sure it is for a specific fight and character - this cannot take dashboard pages or Full Report pages
Just about any detail page is valid: full reports, specific boss, time ranges, etc. It may or may not actually make sense but that becomes your problem.
Experimental!
Drag to your bookmarks bar and while browsing around World of Logs, click the bookmarklet to add the current parse to a saved list. Once you have up to 3 parses selected, hit Compare and have all the URLs automatically sent to CompareBot.
Mark for CompareThis is still very beta. It has worked for me in recent versions of Chrome and Firefox on Windows. IE might require a few more steps (add to favorites, allow it even though it thinks it is dangerous, maybe unblock cookies).
CompareBot can take any details page from World of Logs and compare it against any other.
Some of the ways to use it:
In general, to get to the parse detail page, you will want to go to a parse, pick a specific fight, and then choose one character to get to their detail page for that fight
The detail page looks something like one of these:

Page generated in 7 ms.