Hey
All plants are going to go at their own rate regardless of how perfect we keep the conditions. The royal ak might have a less vigorous veg growth than the green gelato but might prove to be the stronger during flowering.
The only difference is their pot size, so any chance the ak is drying out faster or possibly staying wet longer? Thats the only possibility i could see, if so maybe keep her a little closer to the fan to dry faster and water more often or the opposite, away from air to keep soil wet longer?