New Core Setup and Migration

Quick question. I am setting up a new core on a Sonic Transporter i5. I want to get this set up before I turn off my old mac mini core. Would it be best if I switch the license back and forth while I am working on the new system or should I set up a trial license so I can set up the new system while my family can still listen to music from the old core.

Thanks so much for your insight and guidance.

All the best