I got some info from Stew Mac, wondering if anyone would like to comment.
I inquired about their Through Body Neck, and they confirmed that it is a Carvin piece. So I asked them specifically, is the radius compound 12" to 14.5" or just 15" all the way up & down the fingerboard. They replied that it is 15" up & down.
So I'm thinking maybe the Carvin NT6 K, which is what Stew Mac has with the paddle headstock, is the same radius it always was. Maybe Carvin didn't change the paddle version?