[Question] Difference between two download buttons

After opening one video, two download buttons appeared (both buttons disappeared after disabling the script, so they should both be features of this script). May I ask what the difference is between them?

<img width="334" height="54" alt="Image" src="https://github.com/user-attachments/assets/1e6dd4de-cfa1-4a9c-87c4-a08c9cecfa04" />