It's not as simple as that. Since the 2D Marisa PSA was made over Lucas as a base, you would need to use a P&P rel in order to get her over a different character that is not Lucas.
I once tested this by exporting Link as a .dae, then importing him over Kirby, and checking all 3 of the checkboxes on the left("Force Float..."), and then in the textures panel, I added/replaced the textures corresponding to Link. The results were, I could do any move I wanted as Kirby with the Link skin, but the bones stretched differently; also, when I tried to do the same thing with Knuckles(PSA) and Zelda, both of them froze, from too large of a file and different bones; so, importing characters over other characters, you must make sure that the bones are the same, make sure that the lengths between the bones is the same, or close enough(To not result in weird stretches), and make sure that the file is small enough(Less than the original file's filesize).
Stop talking out of your ass. That is not what this user is asking.
Use the
plug and play .rel files. It requires very little work to use. There's a few more you can get from BrawlEx, which uses the same modules.
This is what you're looking for. Thank you for giving a real answer.