They both suck. No wonder you got them mixed up, KY.
But they suck in different ways, I think. Josh Jones was a Ted Thompson special - a fantastic athlete who Ted must've thought could learn the ways of an NFL safety. He never could, of course. He had no instincts whatsoever and a fairly large ego, which made learning even more impossible.
Josh Jackson was a Gutey pick - in this case, a very productive college guy who had limited athleticism.
But yeah, they both suck. And I'm with George Cumby - Josh Jackson can't help the Chiefs pick up any nuances of Joe Barry's defense, because Josh Jackson couldn't pick up the nuances of anyone's defensive system. Or so it seemed. Or maybe it was just that he was too slow and too grabby. But I don't think the dude ever even played well or much on special teams.