Hmm, never tried to transfer ear morphs, as they are easy to do from scratch with magnets or using Wings3d.

When I tried to transfer V3's head shape over to V4, the ears got messed up big time, much more than the rest.
When I created a LowRez Maddie, the earshape transferred quite nicely.

I'd say unless you want to tranfer the exact shape of the MilCat's or Mildog's head over to V3 or V4, I just wouldn't bother too much with the ears.
Same for the teeth or tounge.

It would be nice to have a perfectly working "one click" script, but I really don't expect a Poser python script to have the same shrinkwrapping functionality that you can otherwise only find in a select few of top-end modellers.
(And even with them it is a multi- step process)