Yes, I think they're tied to separate Lightning accounts, but anything else would make it even more confusing I guess.

nostr:npub1xv8mzscll8vvy5rsdw7dcqtd2j268a6yupr6gzqh86f2ulhy9kkqmclk3x By the way, there's a small UI bug: when you switch accounts, it doesn't immediately update the npub that you can copy from the nostr icon...