Here's what I remember (wish I could find the G$#%$^ photos):
All of the Killer Eggs that I remember were configured with two 7-shot 2.75" FFAR tubes, and 2 M-134's. They also had a type of engine exhaust deflector shroud that angled down off of the regular exhaust you'd normally see on standard H-500's. Bear in mind I'm only guessing at the function, but that seemed like the most plausible explanation (engine exhaust deflection) in my mind. The weird thing is I'm pretty sure that the Six Pax didn't have them. Maybe it was due to an armament thing......couldn't tell ya. Maybe Jonathan knows.
The Six Pax always had benches and FRIES tubes installed.
As far as SATCOM for both of them, I'm pretty sure they had it and I almost want to say that they had X-antennas as opposed to the MH-60's which had SATCOM with batwing antennas. As far as describing the batwing, the vertical blade is swept forward and the horizontal blade is...well...kinda like a squared off batwing. I'd bet a paycheck Gino, Grant, or Avus have a photo of it somewhere.
Lastly, I'm fairly confident that the SIx Pax didn't have FLIR nor even FLIR mounts, controls or displays. And I'm not positive but I think it was the same deal for the Killer Eggs as well. NODs/NVGs were pretty much the name of the game for night missions. They both did have the IR light on the nose. I do know that the MH-60's had FLIR, but at least one (maybe more) didn't have the radar.
Nothing there had plume detectors.
Now......I'm gonna go have a glass of scotch. It was one of those kinda days at work.