Many, perhaps most, are Equity (why you would see the same faces pop up at both parks). Universal is not a union-shop but provides working conditions equal or better to what Equity requires, so union actors can work there. I know a lot of CMs on my Facebook are grateful for that right now.
AFAIK the only Equity positions Universal cut are the pre-show in F&F. Probably Barney, too, but wasn't that cut pre-COVID? Can't recall. FWIW I would miss any of them, they make the park feel alive and vibrant.
BTW, was probably assumed, but this seems to be the end of the Holiday Storytellers as well. World Showcase is two aging boat rides away from being a dead mall food court.