Transfering apple care to new device

FWIW. I recently upgraded to a new Mac mini, trading in my older model which still had an active AppleCare+ plan. In this case, Apple refunded the remaining balance of that existing plan back to my original purchase method. I had to purchase a new plan for the new device.

I am not sure if you can do this - check this article or contact Apple. I know you can transfer to a new owner if you sell it, but I do not think you can transfer to a new device. You can cancel the current coverage, get a partial refund, and buy new coverage for the new one.

https://support.apple.com/en-us/HT202712