Great! Thank you. I guess I should have known that. I think I need another cup of coffee. We usually stay at YC and always walk over to BW and use it there.
I guess the simplest way to put it is that your Magic Band is tied to you, not your resort or your reservation. Actually, it's tied to your My Disney Experience (MDE) account, which is where all of the information about you is stored.
So yes, it'll work anywhere there's a Magic Band reader on WDW property.