The Pe-8 and TB-7 are basically two designations for the same aircraft, as are DB-3 and Il-4. Essentially TB-7 and DB-3 are early designations, Pe-8 and Il-4 late ones.
However, there were subversions that differed from one another. In game we have a Pe-8 with AM-35 engines, and a TB-7 with M-40F diesel engines, which is the key difference here. The main differences between the Il-4 and the DB-3F are the fourth crew member and the upper turret, mounting a 12.7mm gun instead of the 7.62mm gun.
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