Can shopping cart products be shared among different websites?

The statement that shopping cart products cannot be shared among different websites is accurate because each website within a Magento installation is typically configured to maintain its own session and shopping cart data. This separation ensures that user experiences and inventory management are distinct across different brands or websites operating under the same Magento instance.

Magento's architecture is designed to allow different websites to cater to unique audiences, and sharing a shopping cart between them could lead to significant confusion regarding product availability, pricing, and customer data. As a result, each website keeps its shopping cart contained within its own scope, allowing for a tailored shopping experience without the risk of data overlap or mismanagement.

While it is possible to achieve various levels of integration and data sharing within a multi-site configuration, such as sharing customer accounts or product catalogs, the shopping cart itself remains isolated to ensure a consistent and clear purchasing process for users navigating through different storefronts.