I can confirm the rifle is the same size, so he is just a smaller guy.
Risorgimento I'm with you on the bigger builds of JJD figs, I did a little googling and information on the Prince seems rare and possibly jumbled with other black rangers...
I did find this; (which puts Prince at 5'5), however I think I will think of this figure as an adolescent.
This is from "The Annotated and Illustrated Journals of Major Robert Rogers" edited by Tim Todish, illustrations by Gary Zaboly.
"...Robert Rogers' brother James put the following advertisement in The Boston Post-Boy of November 22, 1762:
'Ran away from me the Subscriber at Londonderry, in the Province of New Hampshire, on the 18th of September, a Negro Man Servant named Prince about 40 Years of Age, about 5 feet 5 inches high, speaks good English, had on when he went away a green Coat, blue plush Breeches, diaper Jacket, several pair of thread Stockings with him; he looks very serious and grave, and pretends to be very religious: He is the property of Major Rogers nad has been several Years to the Westward, and pretends to be free.'
Prince had first run away from Major Rogers in 1760*, and one must wonder if the Ranging life with his active and famous master had proved too much for him." pg. 316-7
*[footnote= As reported in The Boston Weekly Post-Boy of April 28, 1760, which noted only he was "meanly dressed."]
"Boston Burn, a black slave belonging to James Burn of Westford, Massachusetts, served as a Ranger in the 1758 campaign." pg. 16