Ah well I'm using NT mod v2 as well, in deed Cid and Aerith share a few weapons. In my case though, Cid and Cloud are using the same sound for some reason. I'll try to reinstall the mod on my side, praying that it will work. In any case ever since I've played with this mod, I cannot think of ever going back.
EDIT : I tried to disable, then reinstall the mod, actually the bug doesn't come from it. Cid's Attacks do the same sound as Cloud's. I also disabled the NT mod to check up; Cid still has Cloud's sounds. It's weird because the mods that alter the sounds whatsoever are Cosmo Memory, NT Mod (due to weapon swap) and EDMusic.
EDIT : Well it seems to come from the 60 FPS mod. Disabling it restored Cid's Sound Attacks