The Rendevous and Its Evil Twin

A couple of weeks ago, I got a call from Avis asking me to call them back and tell them the mileage on my Buick Rendevous. When I called them back and told them the mileage (about 3200 more than when I rented it), they asked me to come into the office. This was going to be a problem, since I am all the way across the country from the office. Fortunately, they said I could go to any Avis location and trade in the car. I was somewhat disconcerted, since the Rendevous was larger than the car I had reserved (a Pontiac Vibe). We worried about how to make sure I got an appropriate car from Avis.

The worrying was all for naught, because the Avis representative said, "Would you like another Buick Rendevous?" The new car appeared identical, save for its California plates, low mileage and lack of a lingering cigarette smell. After looking at it for a while, we came to the conclusion that it might be a shade or two darker than the original, so we turned to photographic evidence.

In the picture above, the original is on the right. It is, in fact, slightly lighter than the car I currently have. How boring is the Rendevous is those are considered two different colors to choose from? Or are those from two different model years?