Your talking about the Bartolini Soapbars? Is that the standard pickups they put in the SKB and LG? I think gard said something that Bartolini makes pickups JUST for these basses. Do you like the soaps better?
Best to talk directly with Gard about that. The 'stock' pickups in the Roscoe line (maybe, 'classic' is a better term, since they also now carry the full line of Aguilar pickups as options) are Bartolini soaps. In the 'lower end' models, they are stock Bart soaps (CS or whatever they are called). In the higher end models, those Bart Soaps are tweaked a bit for Roscoe (more mid response from what I've been told... never directly A/B'd them side by side). More similar than different I would guess.
So, the classic Roscoe tone that has been around for years and years is IMO and IME driven by a combination of unique pickup placement (both soaps closer to the bridge than the classic 'J' placement), and the mid present warm, fat, upper midrange smooth and upper treble ping voicing of the Bart Soaps in one form or the other.
You now, however, have the option of different pickups (J, P. Aguilar soaps, and Bart or Seymour MM), in 'classic' pickup positions or unique ones (e.g., that dual J Bart pickups stacked very close to the bridge to give you the mega burp, or a PJ configuration, or an MM configuration in MM pickup positionl or a J/MM, etc.).
However, the traditional Roscoe tonality is IMO those Bart soaps in the 'Roscoe pickup position'. That is what I went with, since I wanted a 'classic Roscoe' tone.
Nice that they provide all these options for those who want the look and playability of a Roscoe, but with a more 'traditional' tonal profile.
All good stuff!
Edit: One more decision also! The 'classic' Roscoe tone is not only driven by the Bart Soaps in Roscoe position, but also the Bart three band preamp that they have used for years. You now have the option of an Aguilar OB3 or OB1, with any pickup combination for a bit different tonality, which I will let others with more experience with those different pre's in the Roscoe comment on.