I doubt it, type 1 pushrods are compressable, you put them in place overlength then tighten down heads to get them the right length and sealed good. Type 4 pushrods are fitted after the heads are bolted down, through the holes in the heads.
I have used cut to length ones on my type four but found them to be much noisier than the original ally ones .I went back to original stock length ones and used spacers to get the geometry right.The radius of the end pieces look to be the same and theoretically should cause no problem.
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