Do Koreans in China speak the same language as Koreans in Korea? Can Koreans in China understand Korean and Korean?

South Korea and North Korea are two independent countries at present, but the language family is the same. Koreans in China also use the same language. However, due to local differences, there are still differences in accents and expressions. They can understand each other, but they can still tell where they are from, just like Chinese mainland and Taiwan Province Province.