@Paul ******
if you are getting the Non-O visa from a thai consulate before you come the requirements for that visa category are between you and the consulate you're applying for it at.
SO read the requirements for that visa they have posted.
You need to stop thinking of visas from a consulate outside thailand and extensions inside thailand as being related to each other, they are not
Visas OUTSIDE the country are sold at the embassies/consulates who are run by the Ministry of Foreign Affairs Office
Visas/extensions INSIDE the country are sold at the immigration offices run by the Immigration Division of the Royal Thai Police
Those are two completely different gov't agencies and have nothing to do with one another