In 1748 most of the muskets at Louisbourg would have been the 1717’s and earlier 1728’s. The 1728 muskets were in large surplus in Europe too which is what would have been sent to the colonies after 1748. The 1746 was available mostly in Europe but many did make it to the New France and Caribbean colonies. The 1754 pattern Charlevilles were not produced in great numbers when compared to the 1728’s and 46’s. The guns restocked at Louisbourg were likely the 1728’s and 1746’s.
Some sources state that it was the 1717 that remained almost entirely in Europe.
According to Didier Bianchi,
French Military Small Arms Vol. 1 Flintlock Longarms (Mowbray, 2015):
1717--approx. 48,000 manufactured. Flat lock, flat cock. Bridle external between battery pivot and the external spring. 46 13/16" barrel. Bayonet lug on the top. Barrel pinned to the stock as in British practice, but an external barrel band to support the round sling swivel on the side. Fragile stock wrist, with the "cow's foot" butt stock, and a wooden rammer tipped with iron.
1728--eliminated the stock/barrel pins entirely in favor of three barrel bands. Thicker stock wrist. By 1741, an iron ramrod was used. This musket was produced to the tune of 375,000 over a 40 year period. The U.S. Army has an example with provenance to AWI-era Delaware. A google search should turn up the image.
1746--There is disputation of whether this musket, produced in numbers of a quarter of a million, is actually a separate "model" or merely a "breathed on" product improved 1728. People of a highly legalistic frame of mind point to the absence of any Royal Order naming it a separate model. They were, however, marked "M. 1746" atop the breech plug tang! Side mounted sling swivels, iron ramrod, some minor alterations internal to the lock, and side flats at the breech end of the barrel. "Pied de vache" type butt.
1754--something like 210k produced between 1755 and 1762. Sling swivels moved to the underside. Shorter tang on the iron butt plate.
The real sea change in production arrives with the pésant 1763 and the léger 1766... No more cow's foot butt stock, no more goose-neck cock in favor of the more robust version with the "double throat," a hole in the top screw of the jaws retaining the flint, bayonet lug on the bottom, and with a front sight added to the front barrel band. A barrel 2 inches shorter, but thicker and heavier than the preceding models. Often a very high stock comb or cheek piece.
Things get radically complicated by the proliferation of variants, from "rampart guns" to Dragoon models, musketoons, cavalry carbines, etc. etc. etc. But the basic infantry patterns are relatively straightforward.
One will read that many of the "Fusils de Chasse" and so on sent to French North America were produced in Tulle since that is where the Ministry of the Marine typically obtained arms. Maubeuge, Charleville, St.-Etienne all produced similar pattern arms.