Mercedes GLA-Class (2014) is 17 mm (0.67 inch) wider, 55 mm (2.17 inch) higher, 262 kg (578 lbs) lighter and has 121 liters (4.27 ft3) bigger cargo space than Opel Ampera (2020).
Opel Ampera (2020) is 81 mm (3.19 inch) longer than Mercedes GLA-Class (2014).