I wanted to change some formes of the head of G2. Normally I do that by exporting as MorphTarget and importing in ZBrush, then after deforming export again and load as MT in P7. But I also wanted to change the texture of the (morphed) Head. So I started to create one in ZBrush3 too. You can use as they call it Polypainting. Very userfriendly (with some bugs that should be fixed very soon) Now, doing this I realized that I could also export the Head from Poser not as a MT, but simply making a new object from it, sculpt and paint in ZB3 at the same time. And than export the new form as an .obj (with paired up texturefile; this is the case if you do not export as MT) from ZB3.

Then I imported the new HeadObj as a prop in Poser (ca 15% of PoserFigure). Carefully placed it on the real (old)HeadBodypart. 
Finally, I selected the old Head, Object>ReplaceBodyPartWithProp and Hopla! A beatifully, fully functioning and newly textured replacement of the olg 'ugly' head.
(BTW You will notice in the picture that the texture has some flaws; but that will be fixed in ZB3's service release)

BUT, as you can see the new Head does not fit exactly onto the old Neck. This is because I had to resize and place the imported Headprop by hand. 
MY QUESTION: Is there an other, more simple and precise manner to resize and place the imported prop, so I can try this interesting new way to make changes in the look of my Posercharacters in a very straightforward way through the beautiful ZBrush app?