If you have recently received a new passport whilst you are staying in Thailand, you must transfer the stamps from your old passport to your new passports. It should be done promptly within few days of receiving the new passport.
Transferring Visa to a new passport:
You will need to replace or transfer your Visa.
Your passport may have expired.
The name or details on your original passport may have changed.
Your passport may have expired, lost, or damaged.
Transfer of stamp form
Old Passport
New passport
Receipt of notification (T.M. 30)
Departure Card (T.M. 6)
Consulate Legalization (subject to immigration office requirement)
Thai Stamp Transfer Form
We at Chiang Mai Visa Shop can assist you with this process if need be; however, you will need to visit the immigration office to transfer the stamp.
Please see link if you need the Stamp Transfer Form Download