How to shift certificates from one compute engine to another fresh one?

I have a compute engine running at gcloud with all setup done for ssl certificates long ago. I want to change my engine with a different OS version and want a fresh new setup.

How can I take these certificates to new engine? Just copy, or making a fresh new install of certbot there with equal domain names for certificate will bring the certificate to new engine?

Existing: Tornado web server on CentOS 7, certbot 1.0.0
Want to: Tornado web server on CentOS 8 with a fresh new setup.

Both will work.

Just be advised that http validation will fail if both instances are on at the same time.

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