I wasn't worried about any part interchange but the hammers(-2 hammer in your gun has no spring behind the firing pin, later hammers do). A call to S&W confirmed that a -3 and -4 hammer will work. The -5 and later hammers, of course, are flat faced. Aside from the rear sight leaves everything else should fit. I don't recall if they used a floating hand in any of the K's(only familiar with the L's) but even that can be changed to the standard hand if needed.
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