Your right. I found this:

Both the MG1 and MG2 use a rotor containing a V-shaped, high-magnetic force permanent magnet that maximizes the generation of reduction torque. They use a stator made of a low core-loss electromagnetic steel sheet and a high voltage resistant winding wire. Through these measures, the MG1 and MG2 have realized high output and torque in a compact construction.

Looks like if the Prius and TCH are the same other then the ice size. Then one would be able to P&G either car. Could be it's simply in the programming of the prius that allows this.

Here below you can click on motor or generator at the bottom of this page.

http://www.hybridsynergydrive.com/en...rid_motor.html