Mercedes SLK-Class (2017) is 17 mm (0.67 inch) wider, 10 mm (0.39 inch) higher and has 173 liters (6.11 ft3) bigger cargo space than Porsche Cayman (2014).
Porsche Cayman (2014) is 244 mm (9.61 inch) longer and 50 kg (110 lbs) lighter than Mercedes SLK-Class (2017).