No & Yes & Yes/sort of…
Hammers are different size between 357 VS 45 Colt, the 357 hammer will work in a 45 Colt (as will the Single Six hammer, done to help small hands in cocking, ugly but it does work)
Triggers are same/same,,,, with the "Super" exception.
A helpful picture with measurements, that has been passed around,,,, no idea on credits