GMC Sierra 3500HD (2014) is 15 mm (0.59 inch) longer, 3 mm (0.12 inch) wider, 54 mm (2.13 inch) higher and has 575 liters (20.31 ft3) bigger cargo space than Toyota Tundra (2017).
Toyota Tundra (2017) is 97 kg (214 lbs) lighter than GMC Sierra 3500HD (2014).