BMW 7 Series (2018) is 243 mm (9.57 inch) longer and 325 kg (717 lbs) lighter than Porsche Cayenne (2016).
Porsche Cayenne (2016) is 52 mm (2.05 inch) wider, 210 mm (8.27 inch) higher and has 156 liters (5.51 ft3) bigger cargo space than BMW 7 Series (2018).