I’m building something on the Quest so I did a quick comparison and found a similar situation. Attached is the scene in regular editor gamma/colors and what it looks like when I click the ES3.1 preview button located at the top of the editor window (or ES2 if that’s your speed)
Very different brightness indeed. Not sure why that it but at least Unreal has a preview option to help you navigate the difference. Doesn’t answer your question so much as confirm I see something different on the device as well.
