One difference is that the Bolt has a permanent magnet motor while the Tesla has an induction motor. A PM motor is more efficient than an induction motor since

One difference is that the Bolt has a permanent magnet motor while the Tesla has an induction motor. A PM motor is more efficient than an induction motor since the stator doesn't have to do the work to create a magnetic field in the rotor, so theoretically you should be able to get more distance per unit of battery energy than an induction machine. On the other hand, I think induction motors are cheaper than PM motors.