There are two differences first JMM didn't have PAcquaio figured for the whole fight like some people claim, Pacquaio made an changes and JMM lost his advantage he had going. Secondly, Pacquaio is better than he was be a long shot while JMM is worse than he was then. Last but not least Pacquaio is better than JMM, he might not be as good of a boxer, or defensively but his offense is so good he overcomes all his shortcommings and is one of the most special fighters we've seen ina long time.