I doubt whether the breeching of the Model 36 (square bolt) barrel will match the 336's round bolt without extensive gunsmithing.
Barrel steel should be comparable to that used in 336's - nothing really exotic...
Threads are the same, and not much to do to fit it. Bbl steel should be okay unless it has a B or for Black Powder only which I don't think the 36 was so chambered. It has ballard rifling.
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