Converting an 01 to an 02/015 is a pretty big task... you share only a few parts.
Electronics board
Servo motor and potentiometer
Servo gears
Wheels, tires, bearings
You will need an MR02/015 servo saver, which is the biggest change of all. If you're not going to be racing though, I'd keep your 01 an 01. You won't break any servo gears unless you drive like a lunatic.
