Today i decided to ordera riva 510 kit (the kit was less than ordering more attys and batteries etc) as a back up incase parts of my eGo fail. Are the riva (say riva battery on eGo atty..) and egos parts interchangable? I know the riva will be stainless, and my eGos pink so it might not look so great, or maybe it might-but if an atty popped or something, could i 'mix and match?'