There’s the Poly Evolver, which I believe is the closest and even worse to find and impossible at a decent price, and also its age, of course.
But really, even that one doesn’t compare to the dust and dirt that the Prophet 12 can produce like no other. I’ve been on the Prophet 12 module for years and it’s on everything I do. Encoders are getting wobbly, sideburns have their dents, there’s marks and scratches on the metal now … but this one’s not retiring until the world’s out of electrical power.
Having said that, the Prophet 12 is an acquired taste, and not one you necessarily want or need to pursue. It’s a Sequential so it’s good at everything, but it’s not difficult to outmatch it in more classic synth sounds., And it’s a bit rowdy in the frequency department, difficult to tame and lots of little things going on that can turn downright ugly in recordings when you start mixing the results. I’d never get it for classic vintage tones, thundering bass lines or disco leads, for example.
It’s more of a sound design and texture creation instrument, where it sits comfortably in the mid range and touching on low and high range, but provides an output in character that you just won’t find elsewhere.
Closest non-sequential I ever heard was the Summit. And that one didn’t even come close.