It's hard to say if the gearing is different just by looking at the pinion gear, because I dont know what the rest of the gearing is like. Are the rear tires the same diameter?
Maybe some one will chime in that know's the tranny's better then me.
If you want to know what motor has more power between the 2, peek inside and look at the armature, the one with the ticker wire and less wire turns will pull more power.
