It's the same building, and it appeared many times. If you check out the Hazzard Square thread, it was located on French Street behind the court house. I labeled it #25, although the building shown on the aerial view is the replacement constructed between 1997 and 2000.
It was the Hazzard Impound Yard in 'The Sound of Music - Hazzard Style' - see here, and if you scroll down that page you can see it as Boss' car lot from 'Share and Share Alike'. Scroll down further and you can see it as the Apex Rent-A-Truck office from 'Coy Meets Girls'. In 'The Dukes of Hazzard: Reunion!' TV movie the building was Red Perkins' garage (run by his daughter, Mavis) - see here. The building was replaced sometime before 'The Dukes of Hazzard: Hazzard in Hollywood'.