The top horn on the guitar is pointier, and the cutout for the hand on the bottom is wider. I have two links for various Fender body shapes. There are a large number of identical listings, and there's no certain guarantee that they're perfect either.
http://shortscale.org/forum/viewtopic.php?t=38813
http://www.gitarrebassbau.de/viewtopic.php?f=10&t=6&start=0
It would be beyond the scale of luck to find them drawn identically sized, but you may at least be able to find a drawing of each with some sort of inch scale provided. In those two drawings, the belly cutaway on the bass extends well past the top of the neck plate, and you just couldn't get to that guitar from that bass - but you surely can see the seasonings. I don't know what your eye for shapes is like, but if you can just print off some jazz bass outlines, and whatever pictures you can find of the guitar, and get a soft pencil and a good eraser, and just start working on the horns till you get there... this kind of thing I blow up the scale to full size (a roll of 18" by 20 yard graph paper helps) and hang the thing up on the bedroom wall, with the eraser and pencil at hand. And just poke it a little one way or another over a period of time. After a while, it gets to be as good as it ever will. Warmoth does sell a big ol' blank, but with the routing in it.
http://www.warmoth.com/Guitar/Bodies/BodyBlank.aspx
I'm not alone in being temped to finish one off - just like that. :icon_jokercolor: