Smith & Wesson was very good about using the same parts as often as possible in their revolvers, especially sights, screws, barrels, cylinders and springs. You can compare the parts catalogs issued during the period these guns were being manufactured and you will notice that the same diagram or parts drawing is used for different model's parts. Having said that, the easiest way to tell is to disassemble one of each model and compare and swap the parts. You will soon learn which will work and which ones will not. Good luck, Ed.