Hello,
If you are installing a new SEPM, you must use the same version of SEPM as the original SEPM. If you install a newer version of SEPM, you will get an error that the schema is not compatible.
Check these Articles:
Detach and move the Symantec Endpoint Protection Manager SQL database to a new SQL Server
https://support.symantec.com/en_US/article.TECH174821.html
Move the Symantec Endpoint Protection Manager SQL database to a new SQL Server with backup and restore
https://support.symantec.com/en_US/article.TECH132761.html
Best Practices guide to moving the Symantec Endpoint Protection Manager SQL Server database from an existing SQL Server database to a new SQL Server database
http://www.symantec.com/docs/TECH167300
Regards,