One of the threads I read about it in:
All LR motors are the same- MR one is NOT
I don't think anyone has torn a MR apart yet so we don't know 100%, but apparently the parts catalog listed one rear drive motor for all LR (LR RWD, LR AWD, and LR P all use the same; just binned + software limited) and one for all other models (SR, MR).
I don't have an immediate need for the power (not planning on going 140mph haha), but I feel better about getting the same motor that's in the Performance model. Its software limited, which means I'll only be using, at most, 70% of what it's designed for...hoping that leads to longer life and better performance than using a lower-rated / cheaper motor at 100%!
Either way, they're electric motors (though it seems they may be different varieties)...they should run great!