Gamebryo was called netimmerse until 2003. Creation is a modified gamebryo. So Creation 2 will also be based on it. So yes they use kinda the same engine since morrowind. Beteshda will not change away from it because gamebryo is a large reason why the modding community is as strong as it is for skyrim etc. And the modding community sells a lot of copies!
Gamebryo was called netimmerse until 2003. Creation is a modified gamebryo. So Creation 2 will also be based on it. So yes they use kinda the same engine since morrowind. Beteshda will not change away from it because gamebryo is a large reason why the modding community is as strong as it is for skyrim etc. And the modding community sells a lot of copies!