So something that would (at least from the front) look kinda' like this except for the pickup spacing...
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A couple notes...
Jimmy's basses have special custom wound pickups that are specifically targeted to mimic the tone of each era they are intended to represent, so even with the singles in this bass, it won't be the same as that RA (not better/worse, just different).
Also, Roger's preamp does have a character, it's a good one, but it's not specifically designed to sound just like an older Fender, but with adjustment, where Jimmy's is. Roger's take on things is intended to be an "improvement" over that sound for the intents and purposes of recording and live mix performance, but of course that's a subjective comment as well.
The bottom line is, it depends on what your focus is. A similarly configured Sadowsky will NOT sound like an RA (nor should it, IMHO), so if you're trying to focus primarily on a faithful vintage tone, you're probably better off with the product targeted specifically at that (RA). Otherwise, if you're looking for something designed to start with that sound and make "improvements" from there based on some top working pro feedback, the Sadowsky is probably better suited.
However, I STRONGLY suggest you let gig experiences with both decide what's most important to you. It's amazing how one gig can be a mind-changer. I love both vendor's work like crazy, but these are differently targeted instruments, so you can't just make a call without trying both, and you can't try and make one sound like the other (and IMHO nor should you).
IMHO!!!!!