Fantasy match-up inspired from the recent series made by notorious researcher @MarkusFlorez99 "Boxing Evolution Theory", a theory met with skepticism by many users but one that I can see workin' in sum fights.
Probably Beterbiev. Better two handed puncher. More polished overall boxer due to his amateur experience and less likely to cut. That being said, Cooper had a sledgehammer left hook, and if he lands one big one, it could lead to a tko win. I am going with Beterbiev by late round stoppage. I think he is smart enough to avoid the left hook while landing rights of his own and slowly wearing Cooper down.