No. The uniform changes are noticeable, particularly in the cut of the coats. In the middle of the 18th century, British army coats were roomier, more voluminous. Waistcoats were also longer in the hem. The cut became tighter towards the end of the Seven Years War, and the 1768 Cloathing Warrant made formal changes like that, along with other developments that were underway, like adopting bearskins for grenadier caps in place of the previous cloth caps. We provincials, later, Continentals, were also influenced by these changes in military fashion.
Also, the colors are different, both in the color of the coats and the facings.
About the only thing you might be able to do is to use a provincial as a militiaman and explain it as an old veteran of the previous war. George Washington, for example, appeared at the Continental Congress in his Virginia provincials, when he was campaigning somewhat discreetly for the role of C-in-C of the army assembled at Boston.
Hope that helps, prost!
Brad