I'm sure someone else could add to this, but they should be the same except that around the
neck joint (I know you mentioned that) there seems to be a difference in the way they approach it, so if you just trace the whole body and then make your neck joint wider, it wouldn't really fit right. It's not something you have to measure or anything, you can just look at a catalog or photos here on jemsite to compare. The "real" dimensions of the outside of the body should be the same, except for factory tolerances.