hh on Nostr: Recently I read here (could have even been from you?) a note saying that all Nostr ...

Recently I read here (could have even been from you?) a note saying that all Nostr addresses *are* bitcoin addresses too, just by changing the initial characters of the address. Are there any real implications for that? Like, could a Nostr address be used *as* a Bitcoin address in a wallet, for instance? Or the other way around, can a bitcoin address be used as a Nostr address here?