Question about class mods

[Kriber22]

I have a few mods that add subclasses or change the classes of the companions (like making Eder Unbroken/Streetfighter). Now I was thinking of starting up a new character and test some new mods - in particular, making Eder a Stalker/Unbroken. My question is, if I swap out one mod for the other, will the new mod interfere with levelling an Eder started with the old mod, or is this a thing that's fixed as soon as you recruit the character and select their class combination?