Have the two courses been reviewed and adjusted to each other and/or considered equivalents for each other?
This response is based on the information provided. We suggest you discuss with your contracting team, program manager and/or legal department as appropriate.
DAU has no say in how a service, in this case the Air Force, chooses to qualify/certify its contracting officer representatives (CORs). The Air Force made a change to its instruction and apparently added OPSEC Fundamentals to COR training. If the Air Force believes its change affects the content of the DAU course, it would should identify potential/possible issues to DAU. The Air Force is the organization that needs to make any determination of redundancy. DAU has no authority or right to tell the Air Force what its training requirements are, particularly below the DoD level.