Well, mine aren't. My basses have a broad contact surface between and neck and the body. The bolt pattern has 5.5 inch span as opposed to a 2 inch square like a Fender. It makes the bass very solid. If you want some other brand, I can do it for an additional charge.
All basses have a body, a neck and strings.
The shape and the construction methods are really all that separate the different brands. When I see a player on TV, I always look to see what brand of bass they're playing. I can almost always tell right away just from a split second glance at the headstock shape. And in this business, it's everything. I'd be glad to do custom pickups, electronics, frets, strap locks, etc. etc.