If JMM can handle it then Floyd could. Floyd has a better chin than JMM, is bigger, faster, stronger, with much better defense. Pac gets wild which plays into floyds hands. So unless pac catches him with s blind southpaw punch (which is possible) then Floyd beats him and maybe stops him late.
Pac has also never fought a fast accurately guy like Floyd who has top notch boxing skill an defense. Pac was great do anything is possible but is favor Floyd every time