I've done a total replacer of NPCs vanilla hair (some few hair ESMs as Masters).
I've also done a total NPCs armor/clothes replacer (some few armor ESMs as Masters).
Now....Oh God...I have 2 ESP files and they are MUTUALLY EXCLUSIVE !!! ( if I switch load order, I can have either new armors or new hair...not both).
For the first mod, I've just touched on hair model option. For the second one, I've changed only Default Outfit.
But...the second mod brings vanilla hair back, although those hair were previously changed by the first mod.
( When I load both ESPs in TES5EDIT, it shows me two PNAM Head Part for Hair )
Why are they conflicting ? How can I fix that ?
Thanks for any explanation.