To be honest, I wouldn't. Shooting a car is as much about location as it is the car. You need a location which suits the car, and compliments it's use via design. I don't see how you could shoot both an off roader and a coupe in a carpark together, successfully. To be honest, if I saw a shoot like that, it would just confuse me. I'd be thinking "What's with the 4WD and the Coupe? Why are they together?". This is due to the fact that the cars don't compliment eachother. Also a simple carpark doesn't really compliment either.
If you can do this, onyah, but if I was you i'd plan to shoot them both separately and pick your locations to better suit the cars, like you've done above.