Your Super User account and other Stack Exchange accounts are separate, the rep doesn't get transferred^* from Stack Overflow to other sites and vice versa. You'll have to earn the rep in Super User.

^*Except for association bonues: If you have rep > 200 on any Stack Exchange site, then you get a one-time 100 rep bonus when you associate account.

Your Super User account and other Stack Exchange accounts are separate, the rep doesn't get transferred^* from Stack Overflow to other sites and vice versa. You'll have to earn the rep in Super User.

^*Except for association bonus: If you have rep > 200 on any Stack Exchange site, then you get a one-time 100 rep bonus when you associate account.