The Yak T is now just a standard Yak-9 and Yak-9T in one. But the weight, of the gun would be the only real difference. Same engine, same fuselage, wings, tail section, fuel capacity, armor, flight instruments.
I got the impression that the hybrid aircraft were making compromises of performance/realism. Is that so, or do most follow the Yak example and simply combine two aircraft, in a similar manner to the various upgrade kits on the 109 and 190 being represented via loadouts, despite technically being different aircraft?