I’d dare say most of default values related to lights and colors have been changed between these two releases - related 1, related 2. In both threads there’s a section related to porting previous versions of three to the new lights & color setup.
But in case of the screenshots - (1) change all .encoding in textures to .colorSpace, and (2) make sure color textures (ie. scene.background texture and .map textures on the models) are SRGB encoded - then things should look good again 