I believe this to be true. K/Z hats that are still in production have the hex hammer for the Z bottom. The five-point open star was on top. And as the other said, the lower pitch cymbal of the two would be your top.I thought it was opposite. Anyone else have any input?
Different degrees of manhole cover
The K/Z combo was a good idea; I would try any lighter cymbal you have as top rather than using both Zs together.