Is the CARN exam different depending on which state you take it in?

Relocating from one state to another in a few months and trying to figure out if my (CARN) Certified Addictions Registered Nurse prep needs to change based on where I'll be taking the actual exam.

I've been studying "CARN" and the materials seem standardized, but I've heard the exam can vary by state or have different question weights.

Specifically wondering:
- Are passing scores the same across states?
- Does the content on CARN exam differ by state?
- If I pass in one state, does it transfer?

The official resources are confusing on this. Some say it's a national exam, others suggest state-specific versions exist.

Anyone who's taken CARN in multiple states or knows how the portability works — would really appreciate the clarity before I invest more time in state-specific prep.