If you created the head yourself from scratch in your own game, you can just change the face part between low poly head and high poly head. The features should remain intact when you switch. This is how I created my Sundered Souls followers; I created Shion (the mage) with high poly head, then I flipped the switch (under Face Part) to swap to a low poly head to make the other two girls. The method I used is actually used in proper game development; faces are sculpted with high poly models, but are then baked down into low poly versions to reduce processing power required in-game.
If you downloaded the head from somewhere else, you're gonna need to do a lot more work;
unless you're willing to learn how to operate a 3D program like Blender or 3ds Max, there's no in-game way to do it.
The easiest external program that can do it is Outfit Studio, follow this video guide:
To add on, there's also no real reason to convert a vanilla head to a high poly head unless the facial features are so squished that the sharp edges can't be smoothed. Last but not least, high poly heads use different TRI files from vanilla for deformation (facial expressions), so that factors in if you're making a follower with a high poly head. I will cover this in detail in the High Poly Head guide for standalone followers.
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