From which novel, comic or game is this panaled version if I may ask? It's the first time that I hear about that one.
Not the first time for me. My memories about it are a bit fuzzy because it was a long time ago (in this galaxy however), but I think that canonically, the paneled of the Y wing was the original one, but was dropped for some reason by the rebels (possibly because it was faster to modify when unpaneled).
Again, I don't recall where this is supposed to come from, but I'm 70% sure the paneled version is EU canon. Gotta ask my brother next time I see him.