Well you can’t use them as they should, because you do need them to be programmed for each ear.
Yes this can be done in Oticon Genie software.
No they are interchangeable, the buttons are always in the centre.
So you’ll need to program them correctly to your loss, easy enough to do as a DIY project, you’ll need the Noahlink wireless programming device as well, read the user guide to see how easy it is to.