I think so, yes. But I'm not sure my understanding of things is 100% right, either :)
One thing I forgot to say : if you have two provinces with plantations/fur hunters, and they are connected to each other, then only one needs a trade port I believe, the other's goods will be transported to the first one by road, and then shipped.
At least that's what I gather from the French campaign in which both Montreal and Quebec have fur traders, only Quebec has a port and the imported fur total changes when Montreal's fur lodge is upgraded.
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