Granted, I'm no pro or teacher, but I've noticed subtle differences. Sure, I trust that my fingers belong in the same place for pizz and arco, but getting there accurately seems different. For instance, an etude that's an intonation buster for me when playing arco suddenly becomes easier when I switch to pizz. And I've been playing both pizz and arco for a long time.
I can think of a couple of possibilities. First, my son -- a fine cellist -- suggested that the upper harmonics are important for perceiving intonation, and bowing produces more of those. So our ears may be more forgiving when we play pizz.
A second thing is that we pick up on all sorts of subtle audible clues and cheats, such as sliding between notes, hearing the start of a note before it's fully developed, and so forth. Perhaps a benefit of arco practice for us jazzers is that we're deprived of our usual signposts, so we have to develop more solid intonation based on correct technique.