If the test blueprint is substantially the same and you have simply introduced new questions, use statistical equating to set the passing score.
Lessons from a Teacher-Licensing Crisis in North Carolina
The fact that the state felt a need to look into the question of alignment retroactively is curious.
Standard practice for any professional credentialing exam is to start with alignment, and think about alignment at every step. If you’re not doing that, you’re not doing credentialing right.