Certifications are the same across the board.
Not all farmers are certified as organic producers. There are USDA rules that allow those who make less than $5000 USD a year to advertise their items as organic. Regardless of what these people do and use, they can announce it as naturally grown. They can’t use the USDA seal, though.
Nevertheless, they are supposed to present three years of records and they are free to advertise as they want. They are just not allowed to supply them to the big companies that use the USDA logo. The processes it may have gone through or it may go through is unknown to people.