Only true in name though!
Hurjet F404-102 has a maximum thrust of 17700lbf
Tejas F404-IN20 has a maximum thrust of 19000lbf
Gripen-C F404-RM12 (Volvo) has a maximum thrust of 18100lbf
Only the KAI-T50 uses the same power output F404-102 engine as Hurjet. Albeit produced by Samsung under licence.
Tejas‘s MTOW is 13500kg
KAI-T50‘s MTOW is 12300kg
Gripen-C’s MTOW is 14000kg
Hurjet’s MTOW has not been published yet. But should be closer to KAI-T50’s.
Of all these 4 jets, Hal Tejas and Gripen-C have both delta wings and canards. In spite of the engine power deficit, Gripen has more speed and MTOW. It is also the better performing of the two.
Hurjet with multiple uses is going to present a number of hurdles to the designers. According to Mr Demir, in addition to the trainer version, there will be a light attack version of this aircraft as well as a possible Carrier operated version. Hurjet as it is may be underpowered and not structurally sound for Carrier operations. As a light attack aircraft it may need more brawn than it has already as a trainer.
To bring together all three capabilities under one aircraft would not be feasible. Newly designed versions will have to be built.
The most important thing at the moment is, as the first supersonic aircraft, the Hurjet, needs to fly. That is the major target at the moment.
Again, It comes down to the compromise. They are all fundamentally the same engine, but Sweden & India trade in costs for better thurst as GE allowed them to add more materials to the engine such as thickening blades, which increases endurance of parts and pressure ratio.
If you compare the weight of F404-102/103/402 with F404-IN20 & F404-RM12
F404-102/103/402 - 1,035 kg
F404-RM12 - 1,054 kg
F404-IN20 - 1,072 kg
Pressure ratio (26:1, 27:1 and 28:1) & max. thrust of each engine is in the same order
Also, Delta wing gives Gripen C & Tejas additional lift, which again comes with trade-offs.
Boeing, KAI and TAI aren't fools and their design choice is deliberate with T-7A, T-50 and Hurjet. They could have added more thrust to their aircrafts, but chosen not to do so to essentially save money as their goal is producing affordable advanced trainer aircrafts.
Now, even those advanced trainer planes could have different MTOW. For instance, T-7A's MTOW is reported to be only 5,500kg (Boeing hasn't released official specs, which is suspicious) and that's less than the half of T-50's MTOW.
Page details technical specifications, development, and operational history of the Boeing-Saab T-7 Red Hawk (eT-7A) 5th Generation Advanced Jet Trainer Aircraft including pictures.
www.militaryfactory.com
For Hurjet, we don't know what compromise that TAI has made with the aircraft. Fow now what we know is that payload capacity is 2721kg.