Actually, they are the same gun
Funny this came up. Here is a direct quote from an e-mail Feb. 9/06 from the actual KWA manufacturer I deal with:
"KWA is the factory who actually oem KSC guns !! "
It's simply a factory in taiwan that makes these guns for KSC, but must brand them under a different name. Actually tell your freind to check his instruction manual that came with the KWA gun. He will find most likely that even the instruction manual that came in the KWA box is the official KSC manual
Also, The KWA should he received should actually also have the same trades on them too. Any KWA's that I have ordered in the past have had the trades on!