It depends, total conversion mods (AGOT, LotR, etc.) surely are not; I also doubt mods like Fallen Eagle would be compatible either; but I am pretty confident that (as an example) Dark Ages works, cause I am doing a playthrough with this mod.

is this compatible with overhaul mods?

I've made an update that simplifies the mod a bit to make it less prone to weird oversights with the National Church titles.
Though the mod still retains all its features, except now the appointment of the head of church is done through the in-game menu. If I figure out how faith screen interface works, I might add the head of National Church to also be displayed there

Honestly, I just wish there was an option to reform faiths like catholicism to liking if you control Roma, rather than just split away.

Sure, I will (similarly to my other mod)

greeting! what a great mod, I want more Chinese player used it so i have translation it in ck3 mod Chinese submod
would u make a line in description

Here is my Chinese localization.  https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3403925213

btw I reduced decisions costs, compared to screenshots