If you can find the thread talking about it, you can keep the licenses in your old Aids and use the Roger Upgrader software to gain extra licenses for your new Aids.
You just need a working empty (of licenses) Phonak Roger On iN or Select iN or Table Mic II iN for it to work.
Found it - Transfer Phonak Roger X receivers between hearing aids - #31 by Zebras
Ignore title of thread. It is the correct thread where we were talking about receiving free licenses via the Upgrade software that is free to download.