This will help you in understanding
[/IMG]
Russia have various Su-27 variants, and share many parts and equipment. The above graph speaks everything about all cost composition and definations.
Bars and Irbis radars are comparable but bars is heavy thus canard is needed and both Sm and Mki have bars n001. Su 30 SM is based on MKI and have french, israeli, and indian component and for the export the customer can choose from them or russian subsystems and can fire new RVV-SD beyond-visual-range missile and the short-range RVV-MD.
Su 35 differ than both in having single seater, powerful powerplant which includes AL-41F1S engines with thrust vectoring, an advanced fly-by-wire system, and new optronic suite. The canard foreplanes are gone, since other aerodynamic refinements are sufficient to achieve super-maneuverability.
While Russia still hasn't introduced an active electronically scanned array radar — this will likely have to wait until the T-50 is ready — the Su-35S has the next best thing. The centerpiece of the avionics suite is the N135 Irbis, a follow-on to the Bars radar utilizing the same passive electronic technology.
But Super Sukhoi program will again bring MKI at par to Su-35 or may be more.