BMW 1 Series (2014) is 226 mm (8.90 inch) longer, 108 mm (4.25 inch) higher and has 25 liters (0.88 ft3) bigger cargo space than Mercedes SLK-Class (2020).
Mercedes SLK-Class (2020) is 69 mm (2.72 inch) wider and 45 kg (99 lbs) lighter than BMW 1 Series (2014).