well you cant apply the edit to face parts via morpher if they don't contain the exact same vertices as the other model, so what they meant was you can edit the parts alltogether as a good starting point. you'd have to just get close if you want to make other parts of its head match up to any part you already edited.
or the mesh morpher thing maybe, imma give that a look about now in fact.
EDIT: Tried it out, worked just how I imagined it would work, simply select the unmodded mesh group, run the script, then hit the modded mesh group, and it'll get an ok result. only major problem is it liked to take verticies from elements of a mesh group that I wanted to remain unmodded.
http://www.hyperent.com/Hyp-Maxscripts.php dl the first link (installer) install to your 3ds root and go