Most KDE apps will run on Gnome and vice-versa, but they might not run particularly well under those conditions.
I used to run into issues with this all the time. Recently, I find, for poplar apps, there’s always a version built for my chosen desktop environment.
Of course, I’m not very picky, anymore: Libre-this, Open-that, Free-Whatever. I usually find the one that comes up in the app search is good enough for what I’m doing.
Oh, that makes sense. Local multiplayer on SteamDeck can still be pretty rubbish, so I probably just didn’t notice.