Tool to find similar sites

I need a tool or script or site that compares aite A to site B and tells me how many pages and witch pages that are similar or identic.
Is something like this existing?

Green rep to good answers

 

this shoudl help you http://www.copyscape.com/

 

Thanks, but cant Copyscape only compare one page at the time? I want to compare entire sites and find what pages that are copied from site A to site B.

 

The tool which will answer your question is copyscape.com but this will check the main site with others having the same content and will show you the sites which are using the same content as yours.

It also bifurcate the pages of your sites means you can check the pages identical to each other in the content.