This is definitely something worth arguing about.
You're right, as I DO use both kde and gnome. One does say System Settings, the other is Control Center. Hence, I've run into the same situation with "screensaver: which now I have 2 entries, both of which are identical, but alas, click the wrong one, and it asks you if you want to shut down gnome. What a pity that Gnome & KDE devs have to act like a couple of kids in a sandbox, and you stole my toy.
"Stupidity, like virtue, is its own reward" -- William E. Davidsen