The international exchange rate is the same, but the difference is that the spread between each bank and dealer is different, so the exchange rate of each bank or dealer is different. As far as China is concerned, there won't be much difference in the exchange rate prices of banks.

I suggest you shop around before buying foreign exchange. China has a floating exchange rate system: 1. The foreign exchange rate of state-owned banks is the same. On weekdays, the official refreshes the exchange rate figures every 15 minutes. So it's the same to change money at any bank. The buying price and selling price of the bank are different. The price difference is the commission of the bank, and the bank does not charge extra. 3. Go to the bank to buy foreign exchange, watch the bank's selling price, and the bank will sell it to you at the selling price.