I really hope you find Georgie, but if you do, they will need to be kept in seperate rooms for a minimum of 28 days in case of infection, then it would be a matter of slowly slowly, you will need to put them in the same room, then gradually move the cages closer together. Eventually letting them out together supervised, of course. I don't know if you mean to house them in the same cage, don't know how that would work out, maybe somebody else will advise on that, but the quarantine is essential, especially if Georgie has been in the wild for a while, he will need a good health check as well.