For many things in an organization, we document our methods and processes in writing, call them standard operating procedures. SOPs codify the required behaviors in the work that we do together.

Culture is different, because it is mostly an unwritten set of rules that governs our behavior in the work that we do together.

It is always a good idea to have alignment between your standard operating procedures (written), and your culture (unwritten). Because, wherever there is a discrepancy, culture always wins.