The Stingray Special has had the pickup redesigned, and the pre-amp re-voiced accordingly.
I think you would get unpredictable results, swapping out the pre-amp like that (and end up with a redundant battery box), but it might be worth contacting John East.
I haven't had the opportunity to do a direct comparison, but judging by all the demos I've seen / heard (and going by EBMM's design intent), the Special has a more "vintage" (which is marketing speak for retro / passive) tone - ie less ultrasonic clarity, and less sub bass, than the 2 Band's "modern" (by 1976's standards) tone.
The old 1987-2017 3 Band EQ could sound a lot more aggressive, which was due to the tendency to run the mid control hotter, relative to the bass & treble.