It was different because they did not like the idea so the wanted to combined different literatures to make up a new one.
often written in Classical Chinese.
The Chinese and the Japanese are two entirely different people and cultures. Therefore, the literature will be different, written by two different people's authors.
One is fake and the other are extinct.
Military situation and Approach of the Imperial Japanese Army are some crucial differences between Chinese and Japanese historiography of the Nanking Massacre.
In the long run, Japanese tea and Chinese tea actually came from the same place, China. Over a long period of time the Japanese have improved there tea by growing their own. There are a few big differences between the two. The price, the quality, and the taste.
chinese are white and japanese are short
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Chinese, Japanese, and Korean characters are all logographic writing systems, but they have distinct differences. Chinese characters are the oldest and most complex, with thousands of characters representing words or concepts. Japanese uses a mix of Chinese characters (kanji) along with two syllabaries (hiragana and katakana). Korean characters (Hangul) are phonetic and represent sounds rather than meanings, making them simpler and easier to learn.
Taoism, Buddhism Conficuonism, Legalism v.s. Shinto. They are completely different, almost opposites on some cases.
Social and family lifestyle.
I've never heard of a Chinese geisha. It's a Japanese word, and traditionally a Japanese profession.
Yes, knowing Chinese can help with learning Japanese due to similarities in characters and some vocabulary. However, the grammar, writing systems, and pronunciation are different between the two languages, so there will still be significant differences to learn.