Default Roms

I am getting my HTC One next week. I was just curious about different forum roms. What i mean is can the international roms be flashed on tmobiles variant? Like viper one?

Im not new to flashing or modding but could not find a clear answer to my question.
DEVICE: T-mobile LG G2
ROM: Cloudy G3 1.1
Kernel: CLOuDY