I didn't know that was possible
Transfer your AppleCare plan
If you sell or give away your Apple device, you can also transfer the ownership of your AppleCare Protection Plan or AppleCare+ in regions that allow it. You can also transfer your AppleCare coverage plan between your own devices that are the same type of product and within 30 days of your original device purchase.
So, as long as you do it within 30 days of purchase. And it has to be the same type of device obviously, iPad to iPad, iPhone to iPhone etc...
Source: https://support.apple.com/en-us/HT202712
Edit: I am not sure if this "within 30 days of purchase" applies to the old device that you're replacing, or to the new one. The way i read it, i think they mean the original one. So.. in your case, that would not work.
What you could do is cancel the AppleCare+ on that product and get a decent refund. Or even bring a damaged device in, let them replace/repair it and sell the "new" one for more cash instead.
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