GMC Sierra 3500HD (2014) is 129 mm (5.08 inch) longer and 89 mm (3.50 inch) higher than GMC Yukon XL (2019).
GMC Yukon XL (2019) is 13 mm (0.51 inch) wider, 74 kg (163 lbs) lighter and has 181 liters (6.39 ft3) bigger cargo space than GMC Sierra 3500HD (2014).
