I never bought any license from MT whats so ever. All the devices I own are pre-licensed. Even my VMs licensed through the reseller.
Now I have two devices that aged enough that I don’t use them anymore.
Can I use their licenses on my new CHR?
No.
(First search result in the docs for “license,” by the way.)
True, I was looking at the wrong documentation.
https://help.mikrotik.com/docs/pages/viewpage.action?pageId=18350234#CloudHostedRouter(CHR)-CHRLicensing