In general yes they all come from the Amazon rivers system, but the Amazon system is massive, spans more area than the Mississippi, and neons are more generally found in cooler areas (cooler being a very relative term- I don't think we're talking more than the difference between high 70s versus low to mid 80s).
It may not be that big a deal, though, since commercial discus and neons have often been acclimated to the same temps in the LFS... probably depends more on the actual sources of both fish and what they are used to.
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