I could be wrong, but I do not think any of the fusilier regiments were in North America for the FIW. The 27th was at Ticonderoga, but I do not think they had fusilier status until after the war (again, could be wrong about the status of the 27th).
During the French and Indian War (Seven Years War), fusiliers and grenadiers wore a mitre cap. Outside of the mandatory "shoulder wings" found on grenadiers, very unsure of uniform differences. Shoulder wings were mandatory on grenadiers, but "non-standard" on a number of regiments who wanted to look "snazzier". Among the fusilier regiments were the 7th, 21st, and 23rd, none of which wore shoulder wings. However, the 27th did wear shoulder wings .....
From British Infantry Uniforms from Marlborough to Wellington (Liliane and Fred Funcken):
"In the middle of the 18th century the outline of the fusilier closely resembled that of the grenadier and, curiously enough, the grenadier ignition-wick case, which was identical to the old musketeers, was carried by the fusiliers.
The fusiliers were so much like the grenadiers that is was thought unnecessary for them to have grenadier companies, after the fashion of other regiments. Differentiation between the two classes of elite soldiers did not arise until 1768, when the fusiliers were given fur hats, which were not as tall as the grenadiers."
As it regards the American Revolution, I think fusilier regiments were posted to North America. I think K&C or Britains has some fusilier figures for the American Revolution.
