A prototype is functional. It includes mechanical or other features that demonstrate how the product will works. It is not necessarily the final version of that functionality.

A mockup is a non-functional model that is made to resemble the shape of the product.
In the case of an automobile, a prototype will have an engine, transmission, and other relevant mechanical features so that it can be driven.

A mockup will resemble the outward appearance. It cannot be driven.

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