Yeah, I noticed that, but I know they weren't the same figure before and it certainly doesn't look like a Sixus1 figure to me when I load it in Blender.  And I know that when they were released, the PHM Sixus1 figure and the Zygote figures were entirely different meshes.  IIRC, someone called DADZ did a rudimentary rigging for the Zygote figures, but I could be wrong.

Oh, and this figure is way bigger than Poser scale.  But I'll load both the Sixus1 PHM and Zygote figure into Blender and check.