I may be mistaken, but I believe the rotors should be the same, but the can may be different (where the "windings" actually are.) between your two motors. I would send it in to LRP.
OOMSGFX.COM (no longer painting, but take a look for fun!), Roadrunners RC Club
"Racing drivers have balls, unfortunately, none of them are crystal" (David Coulthard)
"I believe the average IQ of a NASCAR fan is only marginally above the things that hit the windscreen during the race. "