Umolle

I have a 1998 Lexus GS 400 and I wanted to add the HID headlights to this car. But I don't want aftermarket, I would like to get the one's out of the newer GS 400 available like GS 430 so I can have SELF LEVELING and HID. Does anyone know if this is a smooth swap and what will I need to get from the Newer car HID system. Thanks any info or experience would be appreciated