Since one of them adds your Charisma modifier as an untyped bonus to your Saves and the other replaces Wisdom with Charisma, do they work together?
No, the new FAQ says Cha is its own source. So if neither is typed bonus then they are same and no stack.
Now this contradicts every a lot of things, but them is now the rules.
Alright, thank you very much for the quick answer. It'll be easy enough to just pick a different trait.