Ross Young has outlined display differences between this year's Pixel Fold and Galaxy Z Fold4. While the pair are expected to feature similarly-sized interior displays, they may look quite different externally. Apparently, the Pixel Fold could launch with a wider aspect ratio than the Galaxy Z Fold4, perhaps in a similar vein to the Oppo Find N.
https://www.notebookcheck.net/Pixel-Fold-Display-details-leak-with-Google-first-foldable-smartphone-set-to-feature-a-wider-and-smaller-exterior-display-than-the-Samsung-Galaxy-Z-Fold4.616934.0.html