KJW are based off TM design for the most part. I'd look around for parts that are TM compatible and do a visual comparison and maybe ask around on higher population forums like airsoft retreat, arniesairsoft, etc. to make sure. Most of the hits I got on google claim its TM compatible although it seemed a few individuals weren't sure.
My KJW 1911 is 100% TM based, so I'd assume the P226 is as it'd be a waste of time to develop new internals when the TM specs could be cloned for cheaper and work just fine.