They don't even use the same car throughout 'Twin Trouble' - at least two different cars are used if you compare the front corner lights. It's probably safe to say that the car that was rolled wasn't used again.
I think all of the cars in question are 1967 Chevy 4-door sedans.
I'm surprised that you didn't spot another blue 1967 Chevy 4-door sedan being driven by Mary Lou Tompkins in 'A Baby for the Dukes' earlier in season 6. That one survived, so it could've been used in later episodes.
They were most likely Impalas, but some could've been Bel Airs and Biscaynes. A couple appear to have the Sport Sedan body. Like with your previous questions about cars being the same across episodes, I think all we can say is they were similar. If they didn't get wrecked, they may have been reused.