After reviewing the diff.txt (9.1 KB) between the two sources you attached above, I understand now much better the situation.
You don’t want to keep two translations of a page, Chinese and English, but to work with the UI in Chinese or in English on the same contents.
It is not possible to separate UI and content translations: if you use the UI in Chinese, will edit the Chinese translation. And if you use the UI in English, you will edit the English translation. This is the way you ended with two different versions!
Read also Translation UI vs Content. More skilful people will correct me or add what they consider useful! Cheers!