That should have been the case because although 10 trainers are from 83 order , all the 18 trainers will be of same standards.
The real mk1a standard are only the 73 single seaters. So Mk1a rollout in Feb 2024 should mean mk1a single seater.
As for how long it takes for trainers getting delivered, I am hopeful of atleast 8 getting delivered by 2024 March.
Mk1A delivery is only for 3. There's plenty of production capacity to deliver all 18 trainers before the first Mk1A squadron is fully equipped.