I've just taken my new install live and everything went well except that I didn't export the certificate from the old server before wiping it.

I have the original files, including the generated csr from the old server, original certificate file and original root ca.

Is it possible to use the old csr and install the existing certificate I have?

I do have a backup of the old server, but I'd really rather not re-install it if possible.

The old server is 5.11 and new one 5.14.