I tried with Christie and Sarah but it wasn't so good.
Yes some head swap are not good, deformed or half deformed (ok in front and problem from side) you need a lot of try with head mix for check what is ok or not, it took me weeks and month for find what is compatible and how fix what is not and I am still searching how fix some of them, unfortunately I can't use Ink_Resshufle anymore for the moment because of 1.04 update but I am sure with Blender/Matesoquia 4 you can edit the face for mix with the one that you want.
Here is a little list from memorie of what is ok :
Ayane - Phase 4 - Kasumi : All these 3 can be swapped without problem
Marie Rose on Ayane - Phase 4 - Kasumi - Hitomi - Kokoro - Sarah - Momiji : half of these character will have problem around nose if you see face from side
Nyotengu on Ayane - Kasumi - Phase 4 - Mila - Honoka (?) : Not perfect at 100% but almost
Rachel on Tina : A very little problem around eyes
Alpha-152 : ANY character swap 100% ok (head + body of same character)
-> Will look deformed in selection but not in movie/fight.
Some of mix are 100% ok or almost perfect but keep in mind head swap work as costume swap, the neck will have problem.
-> As exemple on my screenshots "Nyotengu Face on Ayane" I used a Nyotengu costume swap + head for match perfectly the neck because the game calculate the head as if it was Nyotengu character.