How do the new Industries DLC zones work with the old zoned industry? I see that it's still possible to set up the old farms, oil, ore, and forestry industrial areas and that they unlock earlier in the progression timeline than the new DLC zones. Do the zoned buildings compete with the DLC zones? Do they buy from each other at all? Is there any reason (aside from the cost of the DLC buildings) to use the old zones rather than the new?