GMC Sierra 3500HD (2019) is 363 mm (14.29 inch) longer and 47 mm (1.85 inch) higher than GMC Yukon XL (2021).
GMC Yukon XL (2021) is 12 mm (0.47 inch) wider, 358 kg (789 lbs) lighter and has 818 liters (28.89 ft3) bigger cargo space than GMC Sierra 3500HD (2019).
