A general answer to your question is yes, they are interchangeable. You can even put a new model toggle train in a 1900 if you make a relief in the receiver for the new model extractor. The difference in a long frame and a short frame is all forward of the takedown lever so it has no impact on the toggle train length. I have no idea if the new Mauser toggles will work in an original DWM. I suspect they would but I don't have any experience with the 1970's guns.
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If it's made after 1918...it's a reproduction
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