They are comparable versions of the same truck, and the biggest difference we can see is that GMC charges $500 more for the Sierra SLT than Chevrolet does for the Silverado LTZ. They use the same mechanical components and offer the same major features, and their main differences are cosmetic (grille, interior trim, etc.).
Both are available in six models that cover a range of cargo box sizes from 5.75 feet to 8 feet, extended or crew-cab body styles and two- or four-wheel drive. Base prices (including destination charges) on the Silverado LTZ range from $37,050 to $43,435, and the Sierra SLT runs from $37,550 to $43,935. Aside from price, another difference is that GMC goes a step further in luxury with the Sierra Denali models, which start at $46,455.
You can see how the LTZ and SLT stack up like identical twins with the Cars.com Compare feature, which lets you place specific models side-by-side in a detailed comparison of features and specs.
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