I recently lost a Mavic Pro and bought a replacement. The old one may have been found. (Yea!)

Can I link one controller with more than one Mavic? Not to fly simultaneously, of course, but can I set up to switch back and forth between them?

Wow interesting question. I don’t believe it’s possible but would like to know.

Yea I'd like to know this as well

Yes, you can't link two drone with one RC simultaneously, but you are able to link then separately. Just link the Mavic when you shut the original one down. But note that you need to make sure the firmware's consistent.