Mercedes GLB-Class (2020) is 140 mm (5.51 inch) longer, 47 mm (1.85 inch) wider, 220 mm (8.66 inch) higher and has 270 liters (9.53 ft3) bigger cargo space than Opel Ampera (2017).
Opel Ampera (2017) is 861 kg (1,898 lbs) lighter than Mercedes GLB-Class (2020).