Is a GMC truck just a dressed up Chevy truck?

This is quite similar to the explanation I got from a good friend who was a GM Sales Manager for many years:
"They all start down the line as 'GMC' but if something fucks up along the way, they just stick a bowtie on them"

RIP Gerry
I bought new my 2000 GMC 3500 duelie for a rig truck still in service. The plastic caps on the rear melted cause of mud packed between the rims. A guy gave me 4 simulators with chevy caps, I put the chevy caps on the back, still have the gmc caps on the front. When guys rib me about it, I just tell them that when GMCs get over 10 years old they start turning into Chevrolets, most scoff at that, :rolleyes:some laugh :lol: