I think they are case sensitive. Most of Poser is. The characters I've made from scratch do (at least in some occasions) have material zones and body parts with the same name. Possibly with different casing though. And in general they do not share vertices (I make the groups in one program (UVMapper) and the material zones usually in Poser, with the grouping tool, as I find it easier to select single polys in Poser as opposed to UVMapper Pro))

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.