Hi !
The major difference is that the CPE is not repairable anymore as the firm making the motor is no longer in business. They had to find a substitute and the new motor is too different to fit an old CPE.
Some CPE have the thermal overheat switch installed (mine does) (I think some local regulation required it, and when they made the PLUS version they decided to make it a standard fit).
So if you plan to buy one second hand, be sure the motor is fine and the price is low, because if the motor fails, the whole thing will go to the trash.