Again, I think they're similar but different. The one in 'The Ghost of General Lee' gets into a crash at the end, so was probably damaged. There are actually two trucks used in 'Arrest Jesse Duke'. The one the car strippers get into outside the parts store was originally white, and still has white paint visible inside the cab and patchy bits on the back and roof of the cab. During the chase it's a different truck - they acquire a bed of tires and all the white paint has gone. This is close to the 'The Ghost of General Lee' truck, but the rust/wear spots are in different places.
As they pass Boss' house leaving the square in 'The Ghost of General Lee' they pass a very similar truck. Maybe this was the other one from the episode. It reminded me of the extra General parked in the square in 'One Armed Bandits'.