Actually diffing in excel is quite easy to fix yourself with a macro. Google and you will find a few. It's maybe a screen's worth of code. Essentially you just

Actually diffing in excel is quite easy to fix yourself with a macro. Google and you will find a few. It's maybe a screen's worth of code. Essentially you just foreach sheet, foreach cell, if diff then highlight the cell. You are working with strictly defined data after all, not some hidden magic markup language like word-documents.