You are right both look almost the same and the last dragonfly I bought come with 370 motor I thhink both come from the same factory in China and just minor modified from each importer. if you want to change to the scale body, motor should be 370(speed 300equivalent) the 280 is marginal power and last not long(in keeping enough power to fly beyond ground effect) and use li-poly to reduce weight compensate the weight gained.