I think the motors work in totaly different ways to try to compare like for like. They may have similar RPM properties but feel and operate differently. Be far easier to learn what the KV rating is this would allow for better gearing and motor comparison.
As for the ESC's I would go for the better ones, Matrix EVO and the ilk so if you ever need the extra grunt, you can, plus the ESC operates far more comfortably.
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