As far as I know 13 states are part of CARB (1 more joining next year), but pretty much all vehicles are built to CARB spec since it's cheaper to build to one spec. There shouldn't be a performance difference at all regardless of state. Though there are likely a few models that are not 50-state, its not the RAM 1500.
However, the 13 states currently active for reference are....
- California
- New York
- Massachusetts
- Vermont
- Maine
- Pennsylvania
- Connecticut
- Rhode Island
- Washington
- Oregon
- New Jersey
- Maryland
- Delware
- Colorado (Joining in 2022)