I suspect this screen is more reflective than the Panasonic as it is shiny gloss. Would the old one have been very slightly matt?
Glossy screen finishes reflect less light semi gloss screens. As there’s less light reflected, the picture quality isn’t affected as much as semi-gloss screens.
Theres more to it than that like direct and indirect. which I’ll go into later with a bit of science. Firstly I need to restart my ageing laptop and sort fort for my daughter 🙂
I’ll also take a closer look at your picturers you put up early.