Ford Mustang (2019) is 59 mm (2.32 inch) wider than Opel Insignia Sports Tourer (2014).
Opel Insignia Sports Tourer (2014) is 124 mm (4.88 inch) longer, 117 mm (4.61 inch) higher, 212 kg (467 lbs) lighter and has 228 liters (8.05 ft3) bigger cargo space than Ford Mustang (2019).