In a word:
Yes

More:
There is no link between a Created Cart and a Customer.

Therefore this system allows you to create a popular group of products and share the Key URL, which would allow as many customers who have the "Key" to add that group of products to their shopping_cart in one go.

There are only two ways that a Cart cannot be used;
1. If the cart no longer exists (eg it has been deleted by shopowner)
2. If the cart status is set to off