Country stores, like affiliated sites, have a sibling relationship, but their catalog content differs by country or locale. For example, consider a store that has separate sites for customers in the United States and Canada. The two sites might sell mostly the same products and SKUs. But the sites would need to differ in several ways:
The US site might be in English only, while the Canadian site would be in English and French.
Prices on the US site would be in US dollars. Prices on the Canadian site would be in Canadian dollars.
Although the sites sell mostly the same items, there might be some differences: items that are popular in one country and not the other, country-specific versions of certain items, etc.
Country stores typically do not share shopping carts with each other, because of issues with currency conversion and shipping.