Which are different? The 9/40 and .45?Whoa, Whoa there cowboy, those are different frames !!! I would suggest you don't.
AhhhhSorry, to clarify: I have swapped frames and slides on the 9mm and 40 and they fire perfectly. I have had no issues. The only question I have is if anybody knows if the 45 would swap frame and slide with the 9 and 40 pistols.