different products, same company. they are both(along with QuakerState) product lines of S.O.P.U.S.(Shell Oil Products U.S.)
Just like Pepsico makes Pepsi, Mountain Dew, and Doritos.
or like how your parents made you and your siblings. (same parents, many of the same "ingredients", but definitely not identical products with a different label slapped on the outside.)
or if you prefer to keep your analogies automotive, it's just like how a Mustang, a Fiesta, and a Ranger are all Ford products,and may even have some common components, but they are clearly not the same product.