They are the same car. Why are you charging by brand?
I was going to ask the same thing, why charge more or less for a vehicle when it has the exact-same amount of surface area & same paint characteristics as another one? Just seems like a good way to upset a customer.
I'm picturing a customer coming in with a Saturn Sky and becoming enraged when they find it costs $50 more than the listed price for a Pontiac Solstice, because the Sky's design is "Edgier" lol.