We have a UID changable chip in development; the xM1+ which is a “Mifare Classic” memory structure with changeable sector 0 (which contains the UID).
The short answer to your question is; both the xM1+ and the xNT are ISO14443A tags, but they are totally different when it comes to memory structure and feature set. You might want to read up more about tags, UIDs, cloning, etc. at this thread; https://forum.dangerousthings.com/t/rfid-nfc-tags-cloning-and-emulation