I have to apologise on this - I came in and said "KSC & KWA are the same company" which they're not. What I was implying is that they are almost synonyms for each other.
KSC are a Japanese manufacturer, and KWA are their OEM for many things. KSC manufacturer Pistols and GBBR's under strict Japanese laws, but also make guns for export (where they are allowed to have metal slides etc). KWA were originally used as R&D and OEM purposes, and they have ever since operated from a very symbiotic relationship. Both make products the other do not, but this is just typical of an OEM relationship.
KWA are a Taiwanese company, that also make AEG's. KSC do not because they are Japanese and TM own the patent for the AEG in Japan (who knows why they didn't put in a world-wide patent). There are some differences in the products, as there always are in an OEM relationship (Socom Gear and WE for example) - but that doesn't change what it is.
My apologies for adding to the confusion due to poor choice in words