Angel,

I'm not sure we're always talking with the same thought-train, so I did this image to help illustrate the problem.  As you can see, if you do make both heads into a 'sphere' shape, then yes - they are both now spheres, but the features across the surface of the sphere's don't line up.

If you were using the same method (pushing vertices out) only on one mesh, stopping at the other mesh surface, you'd have the same (but worse-looking) problem.  Since the various features don't line up with each other, you can't correlate the vertices very well.  I could have lined up the noses and lips better, but then the ears and eyes would have been off.  Even as it is, the ears and eyes don't 'really' match very well.

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