My experience (at Phuket Immigration):
- Stamps trasferred with no problem and no cost, they only asked me a complete copy of old passport and first page of the new one.
- 90 days online did not work, had to do it in person at the drive in counter, five minutes.
- I asked about TM30, after consultation they said me that it was better a new one, and I did it online.
- Registration for online services (90 days and TM30) unchanged