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Please introduce yourself here, your Volvo 300 hobby... NO technical support, parts requests or car advertisements here
The second letter (KS, KO, etc) refers to the country specific revision, and denotes things like varing compression ratio and (for injection models) whether it has EGR, Pulsair, etc...
...But we don't worry about all that...its just a B200K to us
5lab and foggyjames already explained it, but if you want to know the exact version, find your VIN (XLB34...) and check this topic. Alternatively, there should be a sticker at the top of the underside of the bonnet with the engine code.