Interesting question as to whether K-36 and K-37 running gear is the "same", especially as to "measurements". But does that mean they are interchangeable? That's a tougher question that I'm certainly not qualified to answer. Perhaps they are the "same" to the same extent K-36's running gear components are the same, but are K-36 components interchangeable? I suspect a good deal of machining might be necessary in either case to achieve the same measurements necessary for any interchange of major components, but that's a question best left to John Bush and the talent in the shop crew.