JDM chassis numbers are just in the format: model code-serial number
I'm not 100% sure what the first digit of the serial number is though. Every S13 Silvia I've seen has a '0' there (eg (KP)S13-0xxxxx). 180SXs have a ton of different things there: I've seen '6' and '8' on zenkis, '0', '2', '3', and '5' on chukis, '3' and '5' on koukis.
With the S14 Silvia it's more clear cut, S14-0xxxxx is a zenki and S14-1xxxxx is a kouki. CS14 is HICAS.
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