Both captures appear to be from outside the chamber. One image is of the man who stood on the right, inside the chamber, holding the baton and a gun. He has fair hair and a receeding hairline. As the video images are from outside the chamber, you can see the passage in both.
If you watch the video of the shooting you will see that those captures are of the same person:
https://twitter.com/dancohen3000/status/1347076676342185984
The video is shot from the stairwell where Ashli and others were escorted. You will also see that the background is a corridor NOT the chamber.
These images are not from the same place at all.