The problem with "Dutch" muskets is that it appears to have been a generic term to differentiate muskets purchased by Britain from muskets made under the Ordnance System ie. The Kings Pattern aka The Brown Bess. The Brits purchased many thousands of "Dutch" muskets (also barrels) in 1706, 1715, 1741, and 1745. These were iron mounted and brass mounted with pinned 45" barrels.
There are two documented Dutch muskets marked for the colony of South Carolina one is brass mounted with a 46" barrel. See pgs 149-160 of the book Of Sorts For Provincials.
The colonial governments of Rhode Island, Massachusetts Bay, and New Hampshire are documented as receiving in 1757, Land Service Muskets of the King's Pattern again the Long Land Brown Bess. See pgs 145-148 of the book mentioned above. Interestingly, Private Simpson of Bunker Hill fame was with John Stark's New Hampshire troops on June 17, 1775.
To further stir the pot, during the Federal Period, the U.S. purchased so-called "Dutch" from the Low Countries, muskets which were shipped from Hamburg. Some may have been Dutch Type IV muskets. Also, many Dutch muskets were sold on the open market in New York and Boston in the early 1800's. per George Moller American Military Shoulder Arms, Vol. II pgs 6-9.
Finally, very good friend of mine that belongs, ASAC states that Moller gave a presentation during which the subject of Dutch flintlock muskets came up, he was quite adamant that, in his opinion, none of the extant brass banded Dutch muskets were here during the Rev War. Don't know how much credence to put in that statement but his reputation as a researcher is impressive.
Does any of the above definitely, 100%, preclude Private Simpson from having held the banded Dutch musket at Bunker Hill?