Does anyone know if the paper feed assy FM1-B500 is the same as the new FM2-A269?

FM1-B500 is used in C3300, C3500, C3700
FM2-A269 C3800 and C3900

Rollers inside the assy might be different but I figure for the rest should be the same; just that the parts # just got changed due to a new supplier.