Is a GMC truck just a dressed up Chevy truck?

I am disappointed that anyone could be confused by this.
Many automakers did the same thing.
A Lincoln or a Mercury was often a fancier Ford.
The Oldsmobile and Buick were fancier than the Chevys. In the 80s, Cadillac offered a fancy version of the Chevy Cavalier. The Cadillac Cimmaron.....
Dodge was a bit more fancy than the comparable Plymouth models.
It was simply a matter of marketing a product to different demographics.
The Cadillac Escalade was and still is a Chevrolet Suburban.