Yes, that works really well and whatnot. Totally reliable way of doing it. :P
Because the flatpak components/dependencies of a program can differ depending on the host (for example if you have an NVIDIA card, it will pull some NVIDIA dependencies), so if you export a program from a non-NVIDIA system to the other, it won't be complete to work reliably on the new system, but the missing parts can be downloaded on the Internet, it's still reducing the bandwidth requirement.
flatpak create-usbbacks up an app and all dependencies for offline use.Yes, that works really well and whatnot. Totally reliable way of doing it. :P
For anyone interested: https://docs.flatpak.org/en/latest/usb-drives.html and https://dataswamp.org/~solene/2023-01-01-flatpak-export-import.html
Ah Nvidia, very true. I’m not sure a solution can exist for that. Nvidia needs the driver to match the kernel.