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'.

Only if it helps me win. 

I'm not sure that it counts as a mistake. The extra officer is manning the roadblock as Rosco drives off, and then he moves the barrier when he come back through. The Hazzard County Police Department was much larger in 'One Armed Bandits', and Boss hired many deputies throughout the series, it's just that this one isn't referenced in the storyline. 

That yellow truck in Arrest Jesse Duke, is the same one from The Ghost of General Lee?

I caught one in Season 2 Dukes Meet Cale Yarborough. When Rosco leaves the road block, and turns around comes back the other way. There's only him and Enos. They're the only Hazzard County cops. But an officer in a Hazzard County Police Department uniform moves the yellow road block barricade out of Rosco's way. Who is this mysterious Hazzard County Officer?