There are probably some minor differences, perhaps in the chassis, but since the Vaders are all certified on the same EPA/DOT certificate, and they concurrently sell both models, mechanically they are the same. I suggest to speak with Pete at Kronik Racing--he is the Vader guru as far as dealers go (member RedCrowRides is among our resident experts on this forum). He sells them, repairs them, modifies them, and has performed, or sold the parts to perform, engine swaps on the little, mighty beasts.
www.kronikracing.com