The glass is better, the PinePhone is just listed as “hardened glass” on the store page whereas the PPP has Gorilla Glass 4.
Maybe read through Pinephone Pro annouced (comment from @amosbatto) if you have a second and want spec compared vs a Librem5 and some first take impressions.
Having a PinePhone already I’m interested in the November Explorer version depending on what updates they showcase between now and then especially in regards to the suspend state and battery life.