New,
I'm not aware of different windings, and timings on plane motors, other than the fact that some are made for pushe, or geabox, usually with an R in the designation.
Heat sink is a good idea for any of them, and as far as I know the graupner motors are typically 380 Mabuchi motors with a metal endbell, bearing (plain and ball) they change the name to speed 400. I'm not an expert on electric motors, but if you get a graupner, speed 400, you will see a little improvement over what you have now. They also have the same screw pattern for mounting in a gearbox.
Tower or whoever you order from should give you a little more tech advice as far as that goes.
Jetts