As far as Dassault goes, they would have a very hard time getting a rafale to match the capabilities the EA-18G has. The rafale is a great fighter but the Growler is an excellent EW platform one particularly when you consider it's capabilities compared to it's cost and size. IMO I doubt dassault could match it's EW capabilities on a fighter that is also carrier capable.
As explained earlier, it just needs some additional internal and external techs to make a normal Super Hornet to a Growler, so it's not the platform that is special, but the techs!
Secondly, the techs integrated into Rafales SPECTRA EWS are part of dedicated EW developments by Thales, meant for EW aircrafts and jamming pods, which makes it to one of the most advanced integrated EW system available today. Any Rafale with SPECTRA already offers similar locating and targeting capabilities like the Growler Lite that Boeing offered to international customers (not approved by US government though). That's why any Rafale is able to do SEAD missions today, without any additional techs or pods like other dedicated SEAD fighters.
The only capability that is left is the addition of dedicated high power jamming pods, to provide escort jamming to other aircrafts since the final development isn't funded by French government so far. They seems to plan to increase the jamming power of SPECTRA and add more powerful jamming capabilities to the AESA radar. That again would make any Rafale to a powerful EW fighter, without the need of external jamming pods.
In the mix of aircraft I suggested for IAC-2 the rafale for A2A and the international roadmap hornet for strike and EW capabilities.
It's the other way around! A Silent Hornet with CFTs instead of external fuel tanks and a weapon pod for BVR missiles, has a lower RCS than a Rafale in A2A config. On the other side, a Rafale with Scalp cruise missiles, AASM PGMs, SPECTRA EWS or a dedicated jamming pods is more capable in strike or EW roles than any Growler Lite that would be available for India.
So if at all, the Silent Hornet would be used for A2A and the Rafale for A2G!
At the end we will have to wait and see what versions will be offered to IN and which requirements will have priorities, because the French are developing certain upgrades for that time too, while the US don't fund these Silent Hornet upgrades at all. And another point might be a development of a naval AMCA, which might come with some commonality between to one of the earlier mentioned once, but I'm sure that the decision will be between F18SH and Rafale.