Hi Jess. Welcome to the forum!
The links to your pictures didn't work, so I took care of your account for you. You should be able to upload pictures to the forum now.
I think you may be experiencing a common confusion with pace cars. There are actual pace cars used by nascar during actual races. Then there are the pace car editions put out by Chevrolet. The pace car editions produced in 2001 were black. But it sounds like you have found one of the rare real pace cars used on the actual race track.
The actual pace cars were many colors. And the graphics varied from race to race, and car to car. The cars get retired after the season and end up being sold off. Occasionally they pop up on ebay or at auctions. They usually have the strobe lights on the roof and in the spoiler on the trunk. But a lot of times they get removed by people to put on their own car or sell on the net separately.
There is a website where you can type in the VIN # and it will give you a complete list of the options and such that the car came with from the factory.