I've never tried to put a Motor Wheel on a Budd Wheel hub or vise versa, but yes you need to use the Budd wheels with Budd nuts. The nuts are cone shaped to center the wheel on the hub (stud piloted)...the Budd Wheels lug holes are all conical shaped to accept the cone nuts (inner and outer).
The attached picture shows the 1955 and earlier Motor wheel (hub piloted) and the 1956 and newer Budd wheel (stud piloted).
Mike B
