@Pipers Look here Pipers friend and have no doubt...
http://www.krilapetrovgrada.org.rs/foru ... pic=2114.0This diorama was made by guy from Serbia, it represent battle of Zenta in 1717...Now as I get it WSS was until 1714 and Austria was one of parcipiants... So uniform hardly was changed during two years and as I saw ilustrations it didn't...Now this guy used mostly Zvezda Russian infantry of Peter the Great as Austrians...
In this case if you don't have exact set of exact uniforme, you can use something that is closest to what you look...For example, for my diorama where I need Turks from beginning of XIX century, I can use Strelets Zouave, and for Rebels Zvezda Cossacks and Italeri American Zouaves...The rule is simple, you don't look every detail, but the most visible details...In your case you use every figures that have Tricorn hat, in my case I use everything that has turban, bearskin hat and vest and can look like fit in ordinary uniforme...There is no dilemma...Have a great time in making you project...