Buick Regal TourX (2018) is 20 mm (0.79 inch) longer, 12 mm (0.47 inch) higher, 121 kg (267 lbs) lighter and has 136 liters (4.80 ft3) bigger cargo space than Chevrolet SS (2017).
Chevrolet SS (2017) is 35 mm (1.38 inch) wider than Buick Regal TourX (2018).