i think some of the brackets are diffrent, the base of the motors the same, but i think that were some stuff bolts to the outer part of the motor is diffrent, and im not sure when they started making the motors in the romero plant, but if its windsor to romero i think the internals are diffrent, like the main caps using jack screws on the romero, and dowles on the windsor, plus some outer stuff like the head covers, and timing chain cover and stuff