When we had to change out my Pfaff 130 motor, the local repair person found a compatible motor marketed for my machine, since nobody makes the exact motor that I had. The amperage on the new motor was not nearly as high as on the original, and there was an orientation problem for mounting. Using a hose clamp, my husband was able to mount it securely, and the electrical connections were compatible. My Pfaff does not run as fast now, but it is acceptable. So, yes, there is a difference in power of various sewing machine motors.