I find there is little tonal similarity between the StingRay Special and the Bongo. Yeah, one can coax them into each other’s territory, but their strengths lie elsewhere. For me, the StingRay Specials provide a more organic, edgy tone, and Bongos are more hifi. The StingRays are more naturally scooped (especially in positions 2, 3 and 4) while Bongos are meatier in the mids and can be searing in the high end. It’s the body woods, pickup locations, pickup/coil selector v. blend and three v. four band EQ. While both have neodymium pickups, they are voiced differently.
Edit: I own both well as pre-Special StingRays. All are 5-strings.