I didn't get all of the fleet action ORBATs, but I know this was an issue in a few of them. Basically what Spartan had said was that with the way fleet action merged some of the stats, special rules, and range bands there wasn't any good way to differentiate some of the units. So a few units were left out going with the basic assumption that you could run either model for the stat card in Fleet Action.
While not exact, you could probably run the Plato as a Plutarch without too much issue.