Buick LaCrosse (2016) is 159 mm (6.26 inch) longer and 6 mm (0.24 inch) higher than Opel Insignia (2020).
Opel Insignia (2020) is 227 mm (8.94 inch) wider, 109 kg (240 lbs) lighter and has 163 liters (5.76 ft3) bigger cargo space than Buick LaCrosse (2016).