Migrating a Tailscale IP address between devices in the same Tailnet

Let me preface this by saying that if I had known about Magic DNS starting out, my problem would not exist - hindsight is always 20/20.

I implemented Tailscale in an environment where about 12 Macs backup to a Debian SMB share via TimeMachine. That connection is made using the SMB share´s Tailscale IP address everytime a Mac wants to backup. Going forward, that Debian machine will be replaced by a Synology NAS, which is compatible with Tailscale.

→ Is there any way to transfer/migrate/reassign the “old” IP address from that Debian machine to a Synology NAS? There is no MDM present, so I would otherwise have to reconfigure every MacBook manually to backup to the new IP/Hostname.

I am grateful for any input. Cheers!