If it is an option you can try setting your material to unlit, though I don’t think that will solve it because I suspect the issue is probably with the post process (unlit view mode ignores post process, but unlit materials still use it, afaik) Unchecking auto exposure in project settings does not disable it, it just makes it set to off by default, and the camera will always have to be set to some exposure level even if it isn’t automatically adjusting.
But, if it isn’t the exposure then it might be the tonemapper. UE4 uses the ACES Filmic standard by default, but a common complaint of Filmic is that it is too contrasty. You can adjust the settings via color grading in the post process, it may be tricky to get a perfectly accurate result though.
You can try mimicin’g the legacy tonemapper, that may work better. There’s a list of settings in that link that will accomplish that