this is a worthwhile read. from @Gamer43
but yeah basically the torque constant is in direct relation to the KV of the motor. so as long as they doesnt over heat and both stays cool, you get the same torque out of the motors per ampere.
however a larger motor generally has a lower internal resistance so it will stay cooler. but if the ambient is cold as f and keeps the temps low it doesnt really make a difference what so ever.
what some people have a hard time grasping is that you dont really add much heat to the system if you just up the settings. sure you might ride more aggressive. and accelerate harder. but it will consume the same amount going 40 kmh no matter your amp settings. getting fatter makes a difference though. so does swaping from street to AT wheels for example.