Comparing binary files

(This thread is a spin-off from this: http://dis.4chan.org/read/comp/1182083741/1-40)

I downloaded 7 linked RARs from Rapidshare. I think that I might've accidentially renamed one RAR during the saving so that I have two identical files with different names.

Could you please tell me if there's some program that can compare binary files and eliminate the possibility of duplicates?

Dear >>3
I'm >>2, i know i can't prove this since i saged in the last post, but i guess it doens't matter does it?

My reply was REALLY helpful, propably the best reply you'll get in this thread.
Instead of trying to google and figure out yourself the great truth behind my reply you've chosen to post something completely stupid and nonsense to make yourself ``look'' pseudosmart to a community full of trolls and retards (like yourself).

hex-editing has absolutely nothing to do with a sum checker tool.
http://www.auricsystems.com/what-is-a-hash-sum