The D-30F6 has 93 kN dry thrust and 152 kN wet thrust. The Izdeliye 30 is expected to have 108 kN dry thrust and 167 kN wet thrust.
It is not an issue of power, the MiG-31 isn't any faster than the MiG-25 and the MiG-25 had 11 ton thrust engines compared with the 15 ton thrust engines of the MiG-31.
These engines don't operate at the speeds required for the MiG-41 so their power is irrelevant.
It all depends on what propulsion they expect for the aircraft when operating at top speed, the D-30F6 already could get the aircraft to speed and altitude where a ramjet could take over and accelerate the aircraft to mach 4.2 easily enough.
The Izdeliye 30 is also a much newer engine operating at higher temperature so should be more fuel efficient.
D-30F6 is already in production and is reliable and available and probably rather a lot cheaper than any new engine.
Making a variable cycle jet engine that allows the aircraft it is attached to to fly at Mach 4.2 makes sense if you want all your aircraft to be able to fly that fast for that long.
But there is no reason for Su-75 or Su-57 to ever fly that fast so we are just talking about engines for the MiG-41 only and it doesn't make a lot of sense to develop the new engine for the Su-57 to also be used in the MiG-41.
It didn't make sense before so the MiG-31 had the D-30F6 and the Su-27 had the Al-31, and it does not make sense now.
As a pure interceptor the MiG-41 will spend most of its time at supersonic speed, which is not something most fighters do because you don't just flick a switch and you are going mach 2... it takes several minutes of climbing and then flying level and straight to get to supersonic speeds and it burns a lot of fuel in the process... and once you get there you keep burning fuel maintaining that speed.... it massively reduces your flight range and endurance when you do it so you only do it for very specific reasons like getting to an interception point a rapidly as possible.
Engine commonality is nice but it has to make sense... plus we are talking about Saturn trying to dominate the market which is also a bad thing in the same way that Klimov dominating the market would be a bad thing too.
You saw a marketing brochure from Saturn claiming their new engine can do everything... we have seen a page from Yakovlev showing a dozen different variants of the Yak-130 including fighter and drone and ground attack aircraft... you will notice only the LIFT was ever actually bought by the Russian Air Force.
We have seen Saturns proposal to use their engine in the MiG-41 and the fact that we have seen that suggests it has not been chosen for the job because otherwise that information would be secret.
This is just a case of you lose so you can advertise to the rest of the world for other customers who might fund your development... it was the same with the Mi-28A helicopter and the MiG-AT, and the Su-75 Checkmate.
Sometimes of course the foreign customer chooses an inservice item to co develop like India with the Su-30M version Su-30MKI and the Yakhont variation, Brahmos.
The AK-203 is also in production in India now too.
What I am saying is that the Soviets and Russians have a habit of having a competition for programmes and that the loser gets to peddle their wares to foreign customers while the winner remains secret and government funded.
Apparently the Izd 30 for the T-50 already has a variable cycle? Such information appears sometimes.
If it has then that is only to allow supercruising at higher speeds, because the Su-57 is not really a great shape for very high speed flight.
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