There's a definite difference but it's not massive.

To me it's less about size but about styles.

Floyd is simply a better technical boxer than virtually anyone else and was able to move up because he relied more on outstanding boxing ability, defense, speed and elusiveness.

Pacquaio is a far mor aggressive, physical fighter than Floyd and needs his greatest boxing assets, power, strength, ferocity, chin, toughness will be reduced with the step up in weight.

I don't think he can beat Oscar, although Oscar I don't think will go hard on Manny anyways. I think it's going to be little more than an exhibition fight really with both fighters being cautious and not a great deal of action.

But having said that Manny has already moved through several divisions and if anything has looked better and more destructive the higher up he's gone. He's an amazing fighter.