Created attachment 115064 [details]
See the screenshots. Tooltips from kinfocenter and system settings should have the same appearance to maintain consistency. Tooltip from system settings look better, it has better spacing.
Created attachment 115065 [details]
Probably just needs some few lines of code copied over from System Setting's tooltips. I gave it a shot but when also unifying the icon sizes it would suddenly start loading black and white icons for some categories :/
Probably affected categories have a 22px monochrome version as well. Maybe KInfoCenter has code to force-downscale the 32px colorful version when there's also a 22px monochrome version, which System Settings does not.
Now they do!