Buick Regal (2017) is 3 mm (0.12 inch) wider and 49 kg (108 lbs) lighter than Chevrolet Impala (2019).
Chevrolet Impala (2019) is 282 mm (11.10 inch) longer, 23 mm (0.91 inch) higher and has 131 liters (4.63 ft3) bigger cargo space than Buick Regal (2017).