Hello MaxDemajo,
Initally to keep the status quo of the environment, the process to migrate a CA is simple:
On the original server:
Backup the CA
Backup the CA registry key
Uninstall the CA role
On the destination server:
Install the CA role
Configure the CA
Import the CA certificate
Modify the exported registry key’s Server Name entry with the name of the new server
Stop the CA Service
Import the modified Registry Key
Restore the CA database
Start up the CA Service
Back up the Certificate Authority
Open up the Certification Authority application
I am also recommending the next official guide from Microsoft: https://techcommunity.microsoft.com/t5/itops-talk-blog/step-by-step-migrating-the-active-directory-certificate-service/ba-p/697674
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