It'd be more relevant to ask about Mig-25 vs Mig-31 and Mig-29 vs Mig-35. The Su-27, Su-30 and Su-35 are very similar: you can tell them apart by some small differences like camos (Su-27 are blue wile 35 are darker) and air brakes (27 and 30 have airbrakes while 35 does not) and by front landing gear (su 27 has one wheel while 30 and 35 have
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