I don't have an sources, but I'm pretty sure that 5G standards are the same the world over, as are the present 4G and 3G networks. As most of us are using smartphones from several manufacturers in the main, the standards of phones shipped to all the markets must be the same, except differing local rules regarding battery safety and recycling etc.
I'm a luddite in regards to tech and for the life of me cannot see any advantage in being on a 5G network for everyday usage. Yes, you can download a huge file in seconds and have crystal clear video calls, but all most people want is a network that doesn't drop out and is consistently there, especially outside metropolitan areas.
Watching and listening to media over the last year it is amazing just how many of the remote participants suffer from disrupted communications.