Is that the case?
Again, I'm new the this product line so I don't really know the history, branding, or product line differentiation.
My understanding is:
Land Rover is the manufacture and Range Rover is a product line, with multiple styles. (Evoque, Velar, Sport etc)
Jaguar Land Rover is the company that owns Land Rover.
Cadillac is a manufacture and the Escalade is a product.
Chevrolet is a manufacture and the Corvette is a product.
General Motors is the company that owns Chevrolet and Cadillac.
I'm not sure the Land Rover/Range Rover is an good comparison of GM/Cadillac & Chevrolet.
Perhaps you are looking for Jaguar Land Rover/ Land Rover as a more direct comparison?
Not sure how a Discovery is posing to be a Range Rover is such a stretch. To me, they are very similar.
People who have seen my car have said "Oh you got a Range Rover". Not a that I purchased "Discovery/Discovery Sport"
Maybe if you take a look at the Cadillac line, a CT4 with CTS or XTS badging, I wouldn't be able to tell the difference.
Or a Chevrolet Colorado to a Silverado, I couldn't tell them apart. I think most people would refer to it as "Chevy" or in "You got a Cadillac"