HowNet and Wanfang database are not exactly the same. Some papers may only be included in Wanfang database, but not in HowNet database. This is because the database and detection algorithm of each detection system are different. There is no internet resource in the database of Wanfang detection system, but HowNet detection system does. If you plagiarize articles that have been included in HowNet online, HowNet can find out, but Wanfang can't.
Therefore, if the paper is only included in Wanfang database but not in HowNet database, it will not be found in the detection of HowNet. However, if the paper is included in HowNet, it is likely that the similar content of the paper will be detected and judged as plagiarism in the detection of HowNet.
When checking duplicate papers, it is suggested to use multiple detection systems for comparison and verification at the same time to ensure the accuracy and reliability of the detection results.