They arent "the same" in a strict sense, they are however, all zenon-made and some have very similar board/identical layouts. However, components and several other slight differences most assuredly exist.
Guess that says a lot for zenon amps.....
Sorry dude, I didnt make it that way.
I forgot Digital Designs, Celestra, Clif Designs and probably many more. Ground Zero...
Earthquake, MA Audio, SounDigital, and a bunch more also have big amps but not exactly 5ks. Theres also Autotek 4000.1d and the Lanzar optidrive 4k... RF 4001bd... bunch of oithers right under 5k.
To my understanding Sundown looked into releasing a 5kw amp. From what I've read many people said they were interested, then Jacob set-up a pre-order and not enough people came through on their word... so he put it aside for more pressing pursuits.