RusAF have in service only following modifications:
Su-27S (standart, see above)
Su-27P (with cutted A2GG ability, see above)
Su-27UB (standart, trainer double-seater with full avionics complex)
Su-30 (group leader command plane, have same radar but improved datalink and wide tactical situation display, very small number of such planes in RusAF)
Su-33 (same weapon control system with Su-27S, improved navigation system)
Su-27SM (improved weapon control system, avionics, weapons and engines, see above)
Su-34 is on final to be get in service, but it is not fact
Others - not in service, only flight demonstrators and prototypes.
About Su-35:
There is no two same planes, all have different avionics.