Welcome to the Strelets Forum. Please feel free to discuss any aspect of 1/72 scale plastic figures, not simply Strelets. If you have any questions about our products then we will answer them here.
The Strelets GNW Swedish without turnbacks and with tricorns and grenadier mitres could be used for early 18th century armies. a problem is their colar, most armies only started to use collars around 1720.
Zvezda GNW Russians don't have a collar. Problem with these soldiers is their very large cartridge box. French cartridge boxes for example were much smaller. (French had for most of the WSS belly boxes btw). Using them for say WAS and SYW is problematic because of their hair style and moustaches.
Zvezda Swedish infantry could be used as French for the WAS and SYW. a problem here however is their long waistcoat. (not to speak about sword bayonets etc)
Conclusion: start making conversions, for mid 18th century is extremely underrepresented in 1/72 world.