Buick Regal Sportback (2019) is 6 mm (0.24 inch) wider than Opel Insignia Sports Tourer (2014).
Opel Insignia Sports Tourer (2014) is 13 mm (0.51 inch) longer, 58 mm (2.28 inch) higher, 100 kg (220 lbs) lighter and has 90 liters (3.18 ft3) bigger cargo space than Buick Regal Sportback (2019).