No I don't think so. Next.js adds a truckload of functionality to React, plus handles the server side, etc.

Expo aims to abstract away everything that a web developer wouldn't inherently understand when moving to mobile, i.e. the native stuff. Whether or not it succeeds in that mission, or if it's worth it, is up for debate.

Expo and Next.js are both React frameworks and Expo also uses React Native. Expo, Next.js: frameworks, React, React Native: libraries.

I think it’s a fair comparison in the sense that they are considered meta-frameworks