When we do migration from R11.1 SP1 to DE R11.3 Sp2 release. the migration utility takes care of migrating all the Users/Groups. Post migration, there few recommendations on how to set new Users/Groups introduced in DE R11.3 release - all these are explained in detail in DE R11.3 ADMIN GUIDE. Hoping that this update is helpful.
Location for DE R11.3 SP2 bookshelf https://support.ca.com/cadocs/7/CA%20Workload%20Automation%20DE%20r11%203%20SP2%20-%20Customer%20Access%20Only-ENU/Bookshelf.html