Except for Indians, they are as different as, for instance, French Revolution wars compared to post-1806 Napoleonic wars; or Early WWI compared to Early WWII. So if accuracy is an issue, you can't mix up these ranges. Otherwise, enjoy playing with proxies. Fife and Drum are anatomically accurate and slim, Perry a bit smaller and stocky, Galloping Major a bit taller than Perry, and a bit stockier too. There are also Conquest (on the smaller side) and Redoubt (on the taller side).