Ok, so today I received a new battery and a new attomizer for my Njoy. I ordered the new attomizer before my old one was worn out. I was messing with exchanging parts and somehow I mixed them up. NOW I don't know which attomizer is the old one and which one is the new one? Is there a way to tell?? I can't visually see any difference and as far as I know they both work (yeah, dumb, I know).