Questions about CHERRY xtrfy K4 RGB Tkl

Is it possible to configure the RGB colour per button? I have seen tests on the internet that say it is not possible. But according to the manual it should work - it says: "YOUR CUSTOM LIGHTING To choose which keys to light up: Press and hold FN + PGUP for 3 seconds. When the PGUP key flashes, press the keys that you want to illuminate. When you're done, press and hold FN+PGUP for 3 seconds." Has anyone ever tried this out? Can you only select whether the key lights up or also determine the colour?

Can you also use this keyboard for the PS4?

Is the black version also TKL? I'm a bit unsure because it's full size in the picture and there's nothing about TKL in the description.

Is there any difference between this keyboard and the "Xtrfy K4 Retro" other than the design?

Does the keyboard have a number pad or not? Because it says TKL and on the first picture there is none, but on the others there is. Moreover, the keyboard is 40 cm long. Too much contradictory information.

Are these switches comparable to the MX-Red switches? Or maybe a little quieter?

It is a Swiss layout and not a German one?