@phreatic Using a network share (on a NAS for example), you can share the same /recalbox/share accross several Recalbox-es on different boards.
You may also share the same /recalbox/saves, however you might get some issues:
We cannot guarantee the version of an emulator on different boards, even in the same version of Recalbox. So, you may face some compatibility issues
If 2 recalboxes play the same games at the same time, they could overwrite their saves each other