No I think they are meant to be the royal guard, the white one is Celestia's Guard, and the reddish brown one is Luna's Guard, going of the fact that the Mohawks on both match the helmet decorations for the guards.



Also because the drone is symmetrical and discord is as far from that as possible. as for arm size, one is closer than the other so appears bigger, and the decoration is on the outside of wings not inside.