The problem of exporting skeletal information from mixamo+blender

I imported the model directly from the FBX file downloaded from Mixamo into Unity, and there were 28 bones. The same model was imported from the FBX file downloaded from Mixamo into Blender without any processing, but Blender showed 33 bones. So, when the FBX file exported from Blender is imported into Unity, there are 33 bones. Why?
The bone information does not match, so I am unable to complete the equipment replacement。

It depends on what bones were added. Typically leaf bones are attached to all fingers so there would be at least 10 more bones. Depends on what bones were added during import.

If your model has no fingers or toes then i suspect one leaf bone for the head and one for each hand and each foot.

Yes, I understand why Blender automatically adds leaf bones. But now I have another question. Is it universal to directly import the bone skin data of unity from the same model downloaded from the mixamo, and to import the bone skin data of blender first and then export to unity?
If possible, how can I set the export options for Blender?