Correct. Doesn't matter where you bought the hardware, once the rom is changed to another country, you can continue to load roms/updates from the same country moving forward.
In the majority of cases this will work, but if a hardware revision for your device is different than what the rom you are installing supports, there is a small chance you might lose some functionlity. Rare, but a small chance for this certainly.
Thanks,
Ricochet_K1
K1_A301_14_14_120109_US