Regrettably, the two sides need completely different methods.
https://max.mailbigfile.com/223bc86eaab1ee515e23f6fb8c67c72f/listFiles.php
https://max.mailbigfile.com/a50117e6ddf4f0ace8e8d67a2f1756dd/listFiles.php
I do have something you could try. It's not perfect by any means, but I think it helps.
Add a Photo Filter layer with these settings:
Then go to the Blend If Sliders and split the white one on the Underlying Layer, and take it almost all the way to the other end.
Then show me.
I agree about gradient map, but you wouldn't start there I don't think. Do the darkening first.
https://max.mailbigfile.com/0e30caf9b8b02b3c6f3dfe9797b1653d/listFiles.php