As of about 15 years ago it was the same pizza. I worked at the Vals at 70th and Havelock and we’d have to run things to them if they started running low.
The main difference would be the stadium pizza isn’t fresh. It sits in warmers for a few hours before the game even starts…
And that might be why I like it more. I've always thought it was odd (or maybe I'm just odd) but I actually don't like Val's as much when it's hot out of the oven. On their buffet, I'll actually choose the one that's been sitting there for awhile as opposed to the fresh one if I have the option. No idea why. I don't notice that anywhere else. :dunno