The same Duties shall be paid on the importation into the said United Provinces of any Article the growth, produce, or manufacture of His Britannic Majesty's Dominions, whether such importation shall be in vessels of the said United Provinces, or in British Vessels; and the same Duties shall be paid on the importation into the Dominions of His Britannic Majesty of any Article the growth, produce, or manufacture of the said United Provinces, whether such importation shall be in British Vessels, or, in Vessels of the said United Provinces.