For example, the last three MCU movies, Black Panther, Avengers: Infinity War and Ant-Man and the Wasp, opened in China three, two and seven weeks after their domestic debuts, respectively.
Therefore, it is a big deal that Captain Marvel will be opening in China the same day as it opens in North America.
Movies frequently have different release dates in different territories, whether that be for financially strategic reasons or as is often the case in China, local regulations.