Is a GMC truck just a dressed up Chevy truck?

I own a 93 S10 2.8 5 speed. I also daily a 91 GMC JIMMY (S15) 2 door 4.3 4x4 with the heavier duty trans (auto). I have yet to find a first gen 2 door Chevy blazer (not the full size now) with the heavier duty components (4.3). So, Is the GMC dressed up? If it is, its dressed for success. With saying this, I have seen a 4x4 pickup (chevrolet) with the 4.3, but not the blazer......only with the GMC emblem. Go figure.

$0.02

Also, I have yet to see a first gen 4.3 in front of a manual trans. Not saying they dont exist, just have yet to see one.