Against Mayweather, Mosley landed 92 of 452 and against Pacquiao he landed 66 of 330. Quite comparable actually. Horrible showing in both cases. Against Mosley, Mayweather landed 208 of 477 and Pacquiao landed 244 of 727.

Manny Pacquiao vs. Shane Mosley - CompuBox Stats

Floyd Mayweather Jr. vs. Shane Mosley - CompuBox Punch Stats