PouchPicks carries cinnamon pouches from ALP, Lucy, On!, Rogue, ZYN. Flavor character varies by brand even within the same family — see each brand's page for its specific cinnamon products.
Cinnamon pouches on PouchPicks range from 1.5mg to 12mg, depending on brand.
No — "cinnamon" describes a flavor family, not a single formula. Two brands' cinnamon pouches can taste noticeably different in intensity and sweetness. Comparing products from a couple of brands is the only way to find the one you prefer.