Changing VPS, how to not confuse letsencrypt?

I don’t understand your basic setup.

Every control panel has an option to install a certificate manual.

So copy the two or three certificate files from your old server and import these to your new server.

Then (some days later) switch your ip address.

Then (again some days later) create a new certificate using the new control panel.

PS: Then you don’t have any downtime.

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