Poly engine parts interchangeability

[Rjpond]

My mechanical knowledge is limited, which is the main reason I replaced the frozen up 259 V8 with a good running 315 V8. I kept everything 6volt which negated using some of the parts that where mounted to the 315. My curiosity is if any internal engine parts from the 259, like the crank, are interchangeable with other poly engines?

 

Thanks

scott