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The closer to your area that the "borrowed" item originates, the higher the chances would be it would be known to the people in that area.
That means geographically close but also economically close. Say you're recreating an area that had extensive trade with Sweden, they'd likely have access to Swedish items as well as locally produced goods.
If they're close geographically to parts of Germany, gear from there would be known to them and likely used.