Audi R8 Spyder (2020) is 292 mm (11.50 inch) longer and 126 mm (4.96 inch) wider than Mercedes SLK-Class (2014).
Mercedes SLK-Class (2014) is 63 mm (2.48 inch) higher, 200 kg (441 lbs) lighter and has 109 liters (3.85 ft3) bigger cargo space than Audi R8 Spyder (2020).