I can't believe I'm answering such a no-brainer. As long as its skinned off a model that came with JO, that same model will have came with JA. Just transfer the jpgs and .skin files accordingly along with renaming the folder, and you're done. Even then, thats only if you want to fix the almost unnoticable saber glitch. All JO skins/models work in JA with a minor glitch for two sabers.
Get a modeling program and re-weigh the mesh to the bones. Or you can throw it into your base folder and hope it doesnt have too many glitches. Or you can try to skin the JA Boba Fett model to look like the one you made.