Hello,
Yes, it would use the same settings as of previous SEPM 12.1 RU2.
If you are planning to upgrade or migrate to Symantec Endpoint Protection 12.1.3, please take a look at the latest how-to article created by our very own SEP content council team.
Best practices for upgrading to Symantec Endpoint Protection 12.1.x
http://www.symantec.com/business/support/index?page=content&id=TECH163700
Hope that helps!!