I think probably the most famous example would be Jack Dempsey and Max Schmeling. here are a couple others in my opinion Mike Tyson and Cliff Couser I also always thought that Pinklon Thomas looked a lot like Ken Norton. Alex Stewart imo looked like a heavyweight Matthew Saad Muhammad. Any others?
Ray Beltran (boxer) looks like a smaller version of Joey Beltran (UFC fighter) - ironically with the same last name, though i'm fairly certain they are not related. http://www.google.ca/imgres?imgurl=http%3A%2F%2Fcdn2-b.examiner.com%2Fsites%2Fdefault%2Ffiles%2Fstyles%2Fimage_content_width%2Fhash%2F5d%2F2b%2F5d2b1063159aa15bab21d5162fbdd1a1.jpg%253Fitok%253DOjIB2y35&imgrefurl=http%3A%2F%2Fwww.examiner.com%2Fslideshow%2Fray-beltran-1&h=324&w=576&tbnid=po4XwX6LkU1fiM%3A&zoom=1&docid=BZuZSaABDBoxyM&ei=26XhU86pEc2yyAS4tYLYCg&tbm=isch&ved=0CCIQMygFMAU&iact=rc&uact=3&dur=1675&page=1&start=0&ndsp=18 https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTfMxPGyELf0_YC5g-LGZQTEv0QEGMY-ISidXCAeM2hhlHeev1O To add to the confusion, I read that Joey Beltran (UFC) is looking to make his pro boxing debut.......in a fight AGAINST RAY BELTRAN!!!! okay I made that last part up, the weight difference is likely huge, but he is indeed looking to go pro as a boxer.
Joe Louis - Coley Wallace is a famous one. Although no great facial resemblance per se, I always felt that with their similar physiques, the 'tache and slightly receding hairline on either side of the head that Bill Costello was a "min-me" of Ken Norton.
I always thought that Tim Witherspoon looked a little like Sonny Liston, Sonny had a darker complexion though.
I did a thread like this a few years ago,funnily enough. Cruiserweight,Elijah Tillery had a slight facial resemblance to Muhammad Ali. Randy Turpin-Johnny Melfah
teofilo stevenson and 60s ali. dempsey and schmeling were twins. oliver mccall to a ****** of the film the planet of the apes