if anything, device and especially software-compatibility should be positively impacted as Flatpak is completely independent in dependencies and more from the rest of the system 
Canonical has made the firefox package a redirect to installing snapd and installing the Firefox Snap. Note that Ubuntu has even prohibited official Ubuntu flavors to install Flatpak in the first place. This happened only partially due to a request from Mozilla to put up Firefox on the Snap Store, but from what I understand they never wanted it to automatically replace the deb package with the snap.
Zorin chose the Flatpak because it's reliable and officially supported by Mozilla.