Mercedes GL-Class (2014) is 78 mm (3.07 inch) wider and 31 mm (1.22 inch) higher than Mercedes X-Class (2018).
Mercedes X-Class (2018) is 194 mm (7.64 inch) longer, 422 kg (930 lbs) lighter and has 480 liters (16.95 ft3) bigger cargo space than Mercedes GL-Class (2014).