Importing & Changing Individual Parts Of a Race's Head

[sprdc]

I'm using COtR and I'm just wondering if there was any way for me to import a different mouth part from another race, as I'm having problems with the mouth glitching and opening a huge amount or not opening at all. I've installed fixes for certain mods so that the mouth works normally with the vanilla Nord race, however when I choose DZ Nord I experience loads of issues. I would really appreciate any help as I have no idea how to sort this out.