[elmimmo]

Kasyan Servetsky created a script[1] to compare two documents using a similar technique within InDesign, no intermediate export necessary. It overlays one on top of the other using the Difference blend mode. Quite resource intensive, so only useful depending on the particular document and machine you do this with.

[1]: http://kasyan.ho.ua/indesign/all/compare_two_documents.html

[crecker]

Really similar to one I have already seen on Photoshop. My goal was comparing the pdfs without any Adobe, my editors do not have license for that.