My post from 2+ years ago edited

For 1970

CHALLENGER
N95 - Evaporative Control System - required on all cars registered in the State of California (N.A. otherwise) .......... $37.85
N97 - Noise Reduction Package - required on all cars registered in the state of California equipped with 440-6 engines or 426 Hemi .......... N.C.

CHARGER
N42 - EXHAUST Bright Tips R/T w/HEMI (N.A. California) .......... STD
N42 - EXHAUST Bright Tips R/T (440-4 & 440-6) .......... $20.80
N95 - Evaporative Control System - required on all cars registered in the State of California (N.A. otherwise) .......... $37.85
N97 - Noise Reduction Package - required on all cars registered in the state of California equipped with 383-4 or 440 engines .......... N.C.

CORONET
N42 - EXHAUST Bright Tips Super Bee & R/T w/HEMI (N.A. California) .......... STD
N42 - EXHAUST Bright Tips Super Bee (383-4 & 440-6) & R/T (440-4 & 440-6) .......... $20.80
N95 - Evaporative Control System - required on all cars registered in the State of California (N.A. otherwise) .......... $37.85
N97 - Noise Reduction Package - required on all cars registered in the state of California equipped with 383-4 or 440 engines .......... N.C.

DART
N95 - Evaporative Control System - required on all cars registered in the State of California (N.A. otherwise) .......... $37.85

POLARA & MONACO
N95 - Evaporative Control System - required on all cars registered in the State of California (N.A. otherwise) .......... $37.85

Although not written in stone, here's my take:
N95 - for any car destined to be "SOLD" new in California, I'm sure some cars with N95 were SOLD new in other states due to dealer trades & sales bank cars that were not in demand in California. Any ordered car that was delivered NEW in the State of California should have N95. N95 concerned the fuel system: fuel tank venting, gas caps, carburetors, etc..

N97 - Noise reduction was accieved in different ways on different body platforms, again California "only".
E-body - eliminate N42 "bright exhaust tips" from 440-6 & Hemi cars.
B-body - addition of resonators on 440+6 cars. These are the same resonators found "stock" on Hemi cars.

N42 - none for California in:
440-6 & Hemi Challenger R/Ts
Hemi Super Bees
Hemi Charger R/Ts & Coronet R/Ts