Buick Regal TourX (2018) is 387 mm (15.24 inch) longer than Cadillac XT4 (2021).
Cadillac XT4 (2021) is 86 mm (3.39 inch) wider, 122 mm (4.80 inch) higher, 22 kg (49 lbs) lighter and has 37 liters (1.31 ft3) bigger cargo space than Buick Regal TourX (2018).