Just finished some more experiments.

Attached picture shows my attempt to transfer V3's head shape over to V4.
The script transferred the general shape quite nicely, but the geometry is completely messed up.
(I excluded the ears and eyelashes with Ockham's script)

The dark spots show zones where the mesh has even double folded.
Tried to clean it up in Wings3D, but it's too much work.
Same happened with an attempt to transfer AIKO's headshape over to V4.

Nethertheless I can only emphasize again that I'm more than happy with the results I get when transferring morphs from V3 to V3RR, or even V4 expressions over to V3RR.

:thumbupboth: