Is there a way for me to get to the N gates in seattle by going through the C&D gate security area?

I am Platinum with AA and I can get into the priority lane in that entrance, but I am flying UA and know that the lines are going to be extremely busy for my flight on 12/27

I am FAIRLY sure that I have connected from the N gates to the C gates without leaving security before, but I am not 100% certain. If someone could advise as to whether or not this is possible it would be of great help!