I'm not sure about this either but I think Greg Cox's novels about Gary Seven are all consistent with The Peacekeeper from DC Vol 2.
Not entirely. They do both use the same name and background for Gary's employers (the Aegis), but "The Peacekeeper" asserts that Kirk hasn't met Gary since "Assignment: Earth," which conflicts with Assignment: Eternity
and The Eugenics Wars
. However, I just disregard the couple of panels in the comic where that's asserted, and that way they can fit.
For the record, Howie Weinstein coined the term (the Aegis) in the comics and I borrowed it for the novels.
It seemed silly to invent a new name for Seven's sponsors when Howie had already come up with a perfectly good one!