I think the major problem here is the vertical/non-canted rudder of the Flanker/J-10, making stealth very difficult. (There's nothing they can do about the J-10 since it had a single rudder, if they decide to modify the Flanker Silent Eagle style then it's a different story)While the Hornet with its canted rudders had a much better chance.
I think the difference in RCS between having a single vertical tail vs two canted tails on what are obviously 4 gen or 4+ gen airframes at best are very minor -- the major difference in RCS would be from the side aspect, where canted tails means radar will not be reflected immediately back at the source like a 90 degree vertical tail would.
But from the frontal aspect, it shouldn't really matter whether it's a single vertical tail or two canted tails; if anything the two canted tails may present a larger reflective surface than a single vertical tail from the frontal aspect.
At the very least, I don't think Super Hornet has any major airframe differences (canted tails included) from an airframe like J-10B/C that makes the prospect of putting stealthy weapon pods on Super Hornet a significantly more useful/viable option than on J-10B/C.
In fact, when talking about stealthy weapons pods it may be more important to consider the overall size of differing respective aircraft instead of only their pre-existing RCS.
