I already created an individual upgraded PACER account when another court made the switch to NextGen. Do I need another PACER login for Nevada? (Feb 1, 2022)

No, you only need one PACER account. With NextGen Central Sign-On, a single PACER login is used across all other NextGen courts.  After you link your PACER account to your Nevada CM/ECF account on March 28, 2022, you will be able to log in using your existing PACER account credentials.