K-4 and other boiler shells

[bnoem1]

Are other boiler shells, such as the Light/Heavy mountain or the 2-10-2 shell compatible with the K-4 4-6-2 mechanism?

I like the idea of the DCC and Sound on a good Pacific mechanism.  While a competitor markets a Pacific, the boiler detail is a deal breaker and I don't run PRR so I'm looking for a Pacific to call my own.