Mercedes B-Class (2018) is 755 kg (1,664 lbs) lighter than Mercedes M-Class (2015).
Mercedes M-Class (2015) is 411 mm (16.18 inch) longer, 140 mm (5.51 inch) wider, 231 mm (9.09 inch) higher and has 204 liters (7.20 ft3) bigger cargo space than Mercedes B-Class (2018).