Man, the guy asked about getting prepared to play jazz, and asked what smooth jazz artists would be the place to start. That's why folks are saying they are so different. I don't care what the labels are necessarily, nor do I care to elevate one stylistic genre over another. But the two are not the same, and it doesn't matter if you want to call smooth jazz "jazz" or not. They are very different. Just because they both contain chord changes that are outside of diatonic norms, using extensions and such for extra color, and more complex melodies than perhaps one might find in pop music, doesn't mean that it's "jazz" in the truest sense of the word. This isn't a big deal I don't think.
Much of jazz involves walking basslines. Very little smooth jazz does. Just on that one point alone, how could working on smooth jazz as a bass player prepare one for playing jazz? Everything I've said in this thread is in reference to the OP's goals. If he wants to play jazz, then he needs to start learning all those basic standards that any jazz bassist would likely teach, things like Autumn Leaves, All the Things You Are, Blue in Green, or any of the endless number of 12-bar blues tunes. The listener needs to also immerse himself in jazz listening, starting with many of the "big" jazz albums...Kind of Blue, Birth of Cool, Blue Train, and on and on. Listening to Dave Coz, Wayman Tisdale or the Sax Pack and learning to play those bass lines isn't really going to help him.
This has nothing to do with genre bashing.