Sorry for double posting (didn't know I could edit the post, I learned now), I took some pictures and while they look equal, I can assure you there's a noticable difference which is really bothering me in real life. I'm 100% certain they were absoulutely identical before the firmware upgrade.
Here's one picture at 100% brightness,
https://i.imgur.com/bvOqeSb.jpeg
and one at 20% brightness.
https://i.imgur.com/EQxMteq.jpeg
You can go into Photoshop/gimp and use the color picker to test the colors, and you'll see the right one is more vibrant and brighter - which is noticable in real life too. Also it's less warm, and it's a real nice pure white, whilst the left one is a little bit warm now, and it's really bothering me.
EDIT: Fixed images.
EDIT:
The difference is pretty evident when the picture is scaled to a smaller size, see:
