Help with displacement maps

ISIKOL

hello everybody...i need your help...

I have asked from a good friend of mine to make me a new muscular morph for m4 ( for poser)
This guy is an expert in zbrush but he has no knowledge on poser whatsoever.
So what i want to ask is...after he has completed the sculpting (veins details etc) how is he going to export the displacement maps following the uv maps of michael 4? I m assuming he is going to have some issues to the seems right? How do we overpass that?

Thanks in advance for your help!