Mercedes SLK-Class (2014) is 3 mm (0.12 inch) wider and 20 kg (44 lbs) lighter than Opel Astra Sports Tourer (2015).
Opel Astra Sports Tourer (2015) is 564 mm (22.20 inch) longer, 232 mm (9.13 inch) higher and has 205 liters (7.24 ft3) bigger cargo space than Mercedes SLK-Class (2014).