Ferrari Roma (2020) is 263 mm (10.35 inch) longer and 188 mm (7.40 inch) wider than Mercedes B-Class (2018).
Mercedes B-Class (2018) is 256 mm (10.08 inch) higher, 175 kg (386 lbs) lighter and has 194 liters (6.85 ft3) bigger cargo space than Ferrari Roma (2020).