Although both North Korea and Vietnam are communist states, Vietnam's economy is stronger than North Korea's because North Korea prohibits political dissent, while Vietnam liberalized its economy by adopting some free-market practices.
The main difference between North Korea's and Vietnam's economies is that Vietnam's economy was liberalized through the adoption of some free-market policies, but North Korea's economy was not liberalized.
The second significant distinction is that North Korea adopted communism before Vietnam.
Therefore, options C and D are correct.
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