Both basses have a 9.5" radius, but the Roscoe Beck V has an asymmetrical neck, whereas the Modern Player Jazz V has a standard “C” neck.
The Roscoe Beck V’s bridge offers the option of top-load or string-through-body, whereas the Modern Player Jazz V’s bridge is top-load only.
Lastly, the combination of mini-toggles and blade-type switch on the Roscoe Beck V offer a lot more pickup selection permutations than the Modern Player Jazz V does. The Modern Player’s rotary selector switch only offers four permutations, though some owners seem to be very pleased with the range of tonality that can be obtained.
Fender Jazz Bass® Club — #361
Avatar Owners Club — #185