Try setting the master flag on the esp, that can fix texture mismatches. Also check that bLoadFaceGenHeadEGTFiles is set to 1 in your fallout.ini, falloutprefs.ini and Fallout_default.ini.
Thanks for all the help, but i went a different way to fix it, changing the body mesh to Type3 Dimonized and using the textures that come with the Mannequin Races mod
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what you using?
Try this one instead if you want the vanilla body.
https://www.dropbox.com/s/rwrbwpm6d4495i4/Mannequin%20Head%20Vanilla.7z?dl=0