Was the Suburban a Chevy or a GMC? Don't GOOGLE it
Just out of curiosity, what did you think the GMC "4 door Blazers" were called?
1935 Chevrolet Carryall Suburban.
But yes, for 67-91, you could buy a Chevy Suburban or a GMC Suburban. Don't Google, use the Brochures.
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Wonder what was different? They had to offer something different.
Imagine a Chevy Corvette and a Pontiac Corvette....
Weirder yet, GM didn't trademark the name Suburban. Dodge also had a Suburban in the 50's I think. wiki says 1955, The coronet station wagon was sold as a "Suburban". The name was more generic back then I guess.

60-66 was that way for sure...I don't think it was til '73 that the only difference was badging. The 60-66 had the GMC only HUGE V-6 too.