the parts are interchangeable - they are basically the same engine - many people have bought parts from the USDM D16z6 that fit onto the D16y1
are they the same? i doubt it - i would say that there are very slight differences to warrant a different name of the engine
so far from the research that others and myself have done - we are hard pressed to come up with any differences between the two engines
the only way to know for sure is to import a D16z6 and put it in a garage with a D16y1 and tare them both down to compare - so far (as far as we know), nobody has done this
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