The main British musket was a .75 caliber, muzzle loading, smoothbore, flintlock fired weapon, accurate to 50-100 yards.(maybe) Bayonets are locked around the muzzle, allowing one to fire while a bayonet is fixed. However, the bayonet gets in the way and slows loading, unless you don't mind slicing your knuckles. Musket balls were soft lead, and would squash on impact. Sights were primitive, the front sight was used for aiming in azimuth, but there is no rear sight, and no way to correct for range. Even if the sights could, the variation in musket ball weight, and amount of hand-measured charge would render it unreliable.

A popular French musket was the Charleville, .69 calibre, so slightly smaller, but otherwise similar. I have a recreation of a brown bess, but have not fired a Charleville in a while and don't recall any other differences.

Plug bayonets and pre-measured cartridges would help immensely.

Baker Rifles are rather fantastic: the same technology, but the barrel is rifled to impart a stabilizing twist to the bullet, and a leather patch created a fine seal between the barrel and bullet. In the early 19th century, they were used with good effect on point targets 400 meters away. I don't recall the sighting system to correct for range and elevation.

Lots of minor differences, materials, calibre, etc. but otherwise all were essentially similar in all major features. Some, for example, had flash shields on the pan, some had conical touch-holes to aid priming. All had similar capabilities and performance.