Gardeniya and Sorbtsiya are analogue, Khibiny and the MSP-418K pod (which can be considered the successor to Gardeniya) are DRFM-based, Khibiny additionally has solid-state phased array antennas like Spectra & DASS in some variants. Since Khibiny acts as the jammer component in an integrated ECM suite, the question of whether the receiver is channelized is a bit difficult. I have a pretty detailed description of the L150-35S ESM component that may well contain the answer, but it's frankly way above my head in terms of Russian language skills and electronics knowledge.
The L150-35S ESM suite is probably the most advance that is actually operational in the Flanker family. According to Kopp, it is fully digital even though he never explained what that means. However I don't believe it is channelized because the materials would clearly state it if it was.
AFAIK, the ESM system is actually comprised of 4 integrated systems :
CKBA L150-35 Pastel RWR;
KNIRTI L265M10R Khibiny-M ECM;
NPK SSP UV missile approach warning system (MAWS); and
Expendable Decoys
The internally stored components of the Khibiny-M system cover 8-18 GHz bands while the optional wingtip mounted pods cover the 2-8 GHz bands giving it wideband coverage from 2 to 18 GHz.
It is probably a very capable system against pulse Doppler radar, I think it might have problems detecting and responding to LPI signals from AESA type radars though.