How to distinguish between non-imitation and non-substitution of resources?

Non-imitative resources refer to the uniqueness of resources, and it is difficult for other enterprises to imitate such resources, such as the patent of Coca-Cola, and it is difficult for other enterprises to imitate Coca-Cola; An irreplaceable resource means that it is difficult to be replaced by substitutes, such as salt, and it is also difficult to be replaced by other substitutes. A resource that cannot be imitated means that it is difficult for other enterprises to copy and imitate a resource. An irreplaceable resource means that a resource is indispensable and irreplaceable for an enterprise, but it is not necessarily unrepeatable.