Hey,
Restoring the PMPC config is easy, we have a guide for that at https://patchmypc.com/backup-and-restore-publisher-settings
You should also consider the code-signing certificate and SUSDB.
If the code-signing certificate private key is marked as exportable, its recommended to move that to your new WSUS server - especially if its a self-signed certificate. If the code-signing certificate is issued from an internal PKI, its not so essential to use-the same one (assuming the code-signing certificate that you use on your new WSUS server to sign updates is also trusted by your clients).
Typically we recommend to use the existing SUSDB if you are doing a site migration. You can install WSUS on your new site server and use the existing DB. You should then also migrate/use the existing WSUS Content folders too. This is a great video on considerations for moving WSUS to a new server https://www.youtube.com/watch?v=bBcJY8_uHCQ - of course, WSUS should be installed be you configure the SUP role as per https://learn.microsoft.com/en-us/mem/configmgr/sum/get-started/install-a-software-update-point
Restoring the PMPC config is easy, we have a guide for that at https://patchmypc.com/backup-and-restore-publisher-settings
You should also consider the code-signing certificate and SUSDB.
If the code-signing certificate private key is marked as exportable, its recommended to move that to your new WSUS server - especially if its a self-signed certificate. If the code-signing certificate is issued from an internal PKI, its not so essential to use-the same one (assuming the code-signing certificate that you use on your new WSUS server to sign updates is also trusted by your clients).
Typically we recommend to use the existing SUSDB if you are doing a site migration. You can install WSUS on your new site server and use the existing DB. You should then also migrate/use the existing WSUS Content folders too. This is a great video on considerations for moving WSUS to a new server https://www.youtube.com/watch?v=bBcJY8_uHCQ - of course, WSUS should be installed be you configure the SUP role as per https://learn.microsoft.com/en-us/mem/configmgr/sum/get-started/install-a-software-update-point