Good evening Jamie and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
I would love to help you with this topic.
To answer your question, I have some pretty good news. You can move your license around as much as you want.
To make a long story short, what will happen once you move it is that you will not longer be able to update the Pro plugin on the site it was removed from.
You can read all about it here: https://theeventscalendar.com/knowledgebase/moving-your-license-keys/
Let me know if that helps.
Have a great day!
Geoff B.