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Buddhism and Hinduism.
Buddhism and Judism.
Two Japanese schools called Shingon and Tendai.
Mandarin Chinese and Cantonese
Buddhism and Hinduism
Hiuen Tsang and Fa Hien
Buddhism
I think they have been adopted Buddhism
The two main religions of the Vietnamese are Buddhism and Roman Catholicism.
There are many differences between China's language and culture and Japan's language and culture. So it is hardly surprising that Buddhist practices in the two cultures are slightly different. Zen Buddhism originated in China when Buddhist practices from India were blended with Daoist practices. Eventually difference schools of Zen Buddhism emerged in China and then found their way to Korea and Japan. It's not that the practices themselves are very different, but they are practiced slightly differently in China than they are in Japan. For example, practicing zazen in China is less rigid and formal than it is in Japan. On the other hand, these differences are relatively minor. At first, monks from Japan traveled to China to learn from Chinese masters and then returned to Japan with what they had learned. So anyone familiar with doing zazen in Japan could quickly adopt to doing zazen in China and vice-versa. With respect to beliefs, there are no differences. Since there is no Buddhist creed, there are no doctrinal differences between Japanese Buddhism and Chinese Buddhism. There are, of course, slightly different ideas about practicing, but, as noted, there are even different schools of Buddhism in China. Most of the differences beyond that are very minor. .
There were two major forms Buddhism took as it spread out of India: Theravada and Mahayana. The Mahayana further subdivided into a number of smaller schools.
The two main religions in South Korea are Christianity and Buddhism.