The research objects of the opening report and the paper have changed, and the topics need to be consistent, but the specific content can be changed. The opening report is just an outline, which is based on and serves the paper. It can explain the core content of the paper, but it can't bring shackles to the paper. In fact, it is normal to make changes when writing a formal paper. On the one hand, you will encounter many practical difficulties when you start working, which you can't meet when you start choosing a topic. On the other hand, with the deepening of your work, you may find that your previous ideas are unreasonable or better.