Not sure honestly. When PBF sits down on his punches, we have seen him stun WW. Except Baldomir of course. Pacman's style is based on him sitting down on his punches, so we know his true power. Hard to tell, even with PBF being larger.
Roach said Pac has more Pop than DLH. DLH has more Pop than PBF. Roach also trained Tyson & he said Pac hits Harder p4p than Tyson.
I think Floyd's right hand is definately stronger than Pacs left but for the other punches i don't know.