✔ 最佳答案
They're completely different even though they were *traditionally* written using the same character (different now). The last answerer, Steffie, is correct in her general idea BUT her history is way off. Japan wasn't strong enough to fight China until the 20th century. However, they began to adopt elements of Chinese culture long before that, sometime around 600-700 AD. I wouldn't call that stealing. If anything, China's was such a strong country a millennium ago that its influence spread to Japan.
1 Chinese yuan = 13.7 Japanese yen
1 US dollar = 7 Chinese yuan = 97 Japanese yen.
So if you send a postal order in Japanese money to China, you'll be sending a lot less than you think =p
P.S. Hmm... I believe that apart from the European Union member states, all other countries tend to have their own currency. In the "Chinese speaking area of Asia" alone, there are four currencies: the Chinese yuan, the Hong Kong dollar, the Macau pataca, and the Taiwanese dollar.