Here are the images - https://imgur.com/a/miTtl
Top image is from player that can read the HDR info and give a watchable SDR image.
Bottom is from player that can’t read the HDR info.HDR videos have different color space than SDR videos. I’m sure you know a lot more that I do about these. BT.709 and BT.2020 but does it really matter in this case of just using colormatch to do it’s magic?
No, you can use one screenshot as a reference to correct the other, as long as you watch it in SDR space.