KSC is for Asia market, whereas KWA is for North America Market.
They should be considered separate entities however they do use the same design and such. When they were a young company I believe it all came out of the same factory with the KSC Japan getting a secondary QC check and the KSC Taiwan going out to market. KWA is a shoot off/subsidary company.
Basically why I say this is because KWA will NOT service your KSC pistols and will in fact refuse to. I believe they will only sell you the spare parts you need but otherwise don't expect support/customer service from them at all.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE