Long time ago, must have been around 2005-2006 right after the P5, release,  someone here put the P4 head on the P5 male.

In a 3D app, he cut out the P4 head including half the neck to reuse, and cut the head including half the neck, off the P5 male.

Then he build a obj file using the P4 male head, and the P5 male body, and reconstructed the polygons to build a new neck and to group them back together.

Then he edited a cr2, to use the P4 head and the P5 body.

All morphs worked on head and body.
But I remember he lost the neck morphs and had to rebuild those as well.

If, and I say if, there are somewhere archives about the 2002-2006 period, it must be there somewhere

I used to have a printout, but. . . . . . Tja, we are 2015 and so many Poser versions and figures later.

A cr2 guru, can certainly pull off something like this.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!