The one listed in TAML failed trials.
Level IIIA is supposed to be used together with Level III and IV. III and IV are hard armours versus IIIA's soft armour. Meaning III and IV use heavy plates. So you aren't making a proper comparison.
Level III/IV and IIIA are used together. And III is good enough to stop 7.62x51. You need IV to stop armour piercing rounds.
So what TAML was talking about is the soft IIIA armour. You can get to level III or IV by simply adding plates to it. The IIIA armour that was used is about 3.8Kg. You put those plates in along with neck, groin etc guards, you get to about 14Kg, while IA wants it to be less than 11.5Kg in total. It's in the same class as the American IOTV.
A major reason why weight was brought down to 1.5Kg in the new armour is due to the use of liquid armour instead of solid armour.
The TEP is also slightly inferior to the new Indian armour because of the TEP's greater weight. The modular design of both armours are similar. TEP comes in at 10.5Kg (only 1Kg less than what IA initially required), but the Indian armour is much lighter.
To give you the reason why it is so, the IA wanted the IIIA to come in at 4Kg, and total weight at 11.5Kg, but DRDO delivered IIIA at just 1.5Kg. Even if DRDO uses the same heavy plates, the total weight of the armour will be 9Kg.
Even with the weight difference, I would say the TEP and the Indian armour are actually in the same class.
What's even better, while the TEP is expected to come in only in 2019, the new Indian armour can start deliveries this year itself, in large numbers.
