I thought there were two main types of infantry in the era, line infantry and light/skirmishing infantry.

Line troops use formations, fire musket volleys and fixes bayonets. They are the main fighting force of the army.

Light troops screen the line troops in loose formation, using aimed (individual) fire, and avoids melee at all cost.

Any further distinctions, such as guard or grenadier, are just different qualities of line infantry, not separate methods of waging war, although the guard units would be commited only under special circumstances. Even militia operate the same way as line infantry, although their quality in terms of drill, rate of fire and cohesion under fire would be drastically lower.

grenadiers did no longer throw grenades in the period, at least not often, instead using musket and bayonet, but were bigger men, traditionally chosen for being able to throw grenades at longer range.

when that is said, Im pretty sure all european factions will have the following troop choices; light, light w/ rifles, line, grenadier(bigger, stronger, possibly better trained line) and guard.

look at the troop types for NTW, pretty much the same.