S&W revolvers do not have any cast parts! They are fabricated by Metal Injection Molding (MIM), which is not a casting process.
With he exception of the screws, mainspring and rebound slide spring there is virtually no interchangeability between forged and MIM guns. In the early MIM guns, where only the trigger and thumbpiece were MIM the triggers were interchangeable. Once they re-designed the lockwork to all MIM, and added the IL and the frame-mounted firing pin, interchangeability pretty well ended.
This applies to the lockwork, not the yoke, cylinder and associated parts.
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