I recently went to find if two of my friends have the same friends, other than me. To get to the compare page for you and a friend, go to your friend’s wall. Click the down arrow on the Messages button and choose “see friendship”. Supposedly, once the page has loaded if you look in the same area on the right you will see another box which will allow you to compare other friendships.
You could also just replace the ‘[username1]’ and ‘[username2]’ fields below and browse to it.
https://www.facebook.com/[username1]?and=[username2]
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