Hello Lincoln,
based on your model, it doesn't look like you are actually comparing the same things. You have the two motor connected to the same simscape network, but them have created a 2nd simscape network where you inject the torque into it. A better test would be to have each dc motor on a seperate simscape network, and not created the simscape network to meausre torque. that is unecessary as you are putting torque into a controlled torque source and then measuring the torque. This is reduntant and you can just look at the simulink signal.
Regards,
Joel
