Meh... I don't see that much of a difference honestly...
Melo was never a freakish athlete. He just has that rare combination of strength, soft touch and shooting that makes him impossible to guard one on one. He's got all the moves and tools to make him an efficient player for a long long time. Guy has the complete package on offense. Even Kobe said Melo has the most complete offense in the league.
All of his problems really stem from the mental side, though I'm sure injuries have something to do with it as well. He's just not a guy who has the drive to do it every single game. He's developed so many bad habits from mediocre teams as well. Its gonna be a tough process for him.
Amare and him are a terrible terrible fit in general. They both need a lot of time to adjust and we need to have some patience. At least we can look forward to see if Lin can make the transition easier.