Mazda CX-30 (2020) is 2 mm (0.08 inch) longer, 9 mm (0.35 inch) wider, 15 kg (33 lbs) lighter and has 389 liters (13.74 ft3) bigger cargo space than Mercedes B-Class (2018).
Mercedes B-Class (2018) is 17 mm (0.67 inch) higher than Mazda CX-30 (2020).