Perversely there is a lot more to a neck than the simple width across the neck, measured by say a vernier across it, the depth front to rear has a very large influence too, there are also smaller/larger radii on the fretboard face and also the shape of the curve on the rear.....its why is always a great idea to try a bass before you buy....see...I'm great at giving advice...but I'm always buying 'blind'
...and errm, just to muddy the waters, some wider 'looking' necks across the face can seem a [i][b]lot[/b][/i] smaller when played, example, my Yamaha RBX4-A4 looks slightly larger than a typical jazz neck, halfway to a precision but feels small and comfy but this is to me.
...but then 'small' don't suit everyone or Stingray's would be a lot rarer.