It depends on the major unknown in this fight which is how much effect each guys punches has on the other. Pac is the better boxer and will land significantly more, however if he can't handle the bigger guys' punches he's in trouble.

I'd be seriously impressed if he were to stop Hatton as he doesn't seem to be the destructive puncher at the higher weight, he had to land at will on the second tier fighter in Diaz at Lightweight to get him out of there after probably near 200 flush shots landed, even if he has the same success against Hatton I'd expect him to still be there.