I think its depends on who attends. I wanted to change my ed visa to another, they told me yes!!, but when I go with my documents, is another person and he said NO!. then change to covid.
You takes every documents you have and you avoid having to come back for some paper. 😉
You only need photocopies of the passport, stamp of the last entry to the country, the last visa, TM6 and 1 photo. 1900 thb. at the office they give you the form to write. Nothing more. I did that yesterday in phuket