BMW 1 Series (2014) is 125 kg (276 lbs) lighter than Mercedes B-Class (2020).
Mercedes B-Class (2020) is 59 mm (2.32 inch) longer, 48 mm (1.89 inch) wider, 151 mm (5.94 inch) higher and has 45 liters (1.59 ft3) bigger cargo space than BMW 1 Series (2014).