It depends really, as that wouldn't interfeer with say, the mane six, the CMC and the likes right? I just ask as with Dawn, there are two versions of her, the older one from your Cyberpunk RP and her usual, filly age (who can fly mind you). granted, she's still not going to really have any screen time, if any really.
It'll just be weird is all, if there are two versions of her around and what have you.