Intresting, I'd put it the other way around, completely different actually. Again, my thoughts:
Zoners are inactive neutral guys, they deal in local market, such as common resources like water and food selling to criminals that land on their bases. And I dont think they smuggle much if they do at all, I thought they only keep Artifacts on bases for random pirates to buy and deliver for their own use?
Junkers are active guys who crave for power, they bribe authorities, pirates, trying to reach influence in a silent, quite underground way. They are active since they do the actual trading (smuggling more so). Remember that scap metal is more like cover than actualy buisiness. They are far more corrupted than Zoners, so they also must have more corrupted activity.