Su-30MK:The commercial version of Su-30M first revealed in 1993. Export versions include navigation and communication equipment from Hindustan Aeronautics Ltd.
Su-30MK2:Su-30MKK with upgraded electronics that enabled support for anti-ship missiles.
Su-30MKV:Export version for Venezuela is most likely to be similar to the Su-30MK2.
It is my understanding that the Indian version (Su-30MKI) would be the more capable aircraft with TVC and avionics from Israel, Russia and France.
The RAAF Superhornet is no diffrent than the one F/A-18F's currently operating with the US Navy; I'm not certain however if there are any store restrictions on the order. Twelve of the current 24 Australian Superhornets have been wired on the production line for future modifications to EA-18G's. The Superhornets are primarily taking over the role of the exsisting F-111's so anti-shipping, strike, etc.