The differences.

-"Project M Forward Smash" folder contains
3.5 Thany+PM "Hybrid" Roy but with his Project M
Forward Smash for balance.

-"Thany's Forward Smash" folder contains
3.5 Thany+PM "Hybrid" Roy but with Thany's Forward
Smash animation, however, the forward smash also moves
Roy forward giving him more range than even Marth.

It's up to you to choose whatever you want, pictures are included
in the individual folders. Once again, I give credit to Thany and the
Project M team, without them I couldn't have done this. Enjoy!
P.S For information about "Hybrid" Roy visit here: http://tinyurl.com/ljvngyn