First, the update speed is different. Some websites are very fast, for example, they are updated as soon as the third quarterly report comes out, while others are slower. However, in this respect, it is hard to say which website is updated quickly, because this quarter is fast, and next quarter may be another fast. The quickest way is to go to official website in Shenzhen Stock Exchange and Shanghai Stock Exchange.
Second, the criteria for calculating the P/E ratio are different, some are based on the performance of the previous year, some are based on the performance of the last four quarters, and there are other calculation methods.
Generally speaking, it is very important to pay close attention to the announcements of listed companies if you are concerned about performance. The results announcement date can be directly queried on the official website of the Exchange, which is faster and more accurate than all financial websites (they also go to the Exchange website to obtain data). In addition, don't just pay attention to the price-earnings ratio, but look forward to the future performance.