Yes and that makes it easier to collaborate. The Russian territory near that common border is lightly populated/ industrialized unlike the Chinese who have some major industry. The refugees would be more likely a burden to China than Russia by the past history of Chinese relations with NK.
Vladivostok is not that far from the border with North Korea, and it is both populated and industrialized, as well as having port access. Vladivostok is a strategic city. During the Cold War, it was a first-class target.