IIRC, the art showed all of those characters with Commander rank pins (and Naraht was in charge of the bridge on the night shift), so I think we were supposed to swallow the notion that these characters had stayed on the same ship through their rank advancement. (This is slightly more plausible since they were all on the Excelsior, where Scotty was already canonically supposed to be Captain of Engineering.)A number of her novel characters (such as Naraht, Harb Tanzer, Kerasus, and Burke) also appear in her stories for DC's TOS comic, "Double Blind" and "The Last Word," though it's hard to tell whether those are really consistent with the Duane novels since they're set in the post-ST III era, and one would've expected those characters to advance more in rank in that time.
In the Duaneverse, it always seemed like her characters were supposed to be an extension of the Big Seven, sticking together with that group from mission to mission and ship to ship (always just offscreen in the filmed material, I guess). If Duane had ever written a story set aboard the 1701-A, I'd expect those characters to be there, too.