When Vue6 came out, I wanted to test the new displcement, but since I don't own ZBrush, I went to zbrushcentral and downloaded the 2 low poly models with their respective maps that are offered for testing your renderer. These are a low poly primitive man head, and a sword. The sword map works wonders, the head is not too good. But to be able to make the maps work, you need to change the map's y scale to -1, just the same as in Cinema4D, if you have it.
Now this is all I can tell about ZBrush maps, I don't have the app, and I don't know how it works. At all.
Oh, both maps were GUV tiled. I don't know what it means, and I don't know if other kind of maps work.