All paint colors are unique. Even cars that come off the same production line, with the same paint lot number will eventually become unique to one another. Factors such as sun, snow, rain, and other factors are situations unique to each individual car, therefore the paint of the car becomes unique, so no two colors are the same. Technology now exists using spectroscopy to provide perfect color matching. In addition to that auto manufacturers publish detailed information about their paints and paint swatches are provided for matching. In addition to the swatches that match the original color, swatches are also provided to show the minor color shifts over time providing some options to find you the best match whether your car is fresh off the assembly line, or a little more seasoned.