I am working on a mod with a bunch of mannequins made from different user created body data and have got to the point of giving them new faces.

I have exported the data of the faces I want to use with the CTRL_F4 method but have now hit a hurdle.

I copied the head TriShapeData from the exported nif into a copy of the vanila head nif. All looks good in Nifskope.

The new heads are loading in the editor but are like some weird mutation of the original.

What is the right way to get these heads working properly?