well, i think they are similar in power, but the content the light assumes after i breaktrough is completely distinct.
I put it this way because i think it is somewhat the same realm, but what changes is how that omnipresent interconnected light appears to you.
While the spice gives me light formations just wierd enough to my mind assimilate it somehow, and make comunication and interaction possible, and i am able to bring back something.... Sally is pure potential. light in its most abstract form, i cant dare to try to understand it, for me the best atitude to have is to simply be! zen mode on, and the trip goes super well!
but one of my most amazing experiences was like this:
It's a happy day and i feel in the right state to injoy a bowl of spice.
I grab my bong, and realized that there where some burned herbs in the cone, so i just put a fairly big and beautifull cristal on top of it. Right on! Light it up, inhale the smoke, hold a bit, and youhuuu!

straight to hipersp.... wow, wait, why are the walls starting to melt instead my mind being projected to hiperspace?? :surprised
"Fuck!! now crosses my mind that the herbs on the cone where actually salvia 40x that a friend of mine smoked, and he didnt liked it, so there was a LOT of it still not burned...
well, the only thing left to do is to lay back and enjoy the ride!"
but as i lay down the giant picture of buda i have on the left side of my bed catches my atention.... and when i realize it i see a tridimensional (correction: multidimensional) alien buda coming out of the wall and floating in front of me!
All the rest of my perception of reality was intact, i could see my room around me, my mind was completely clear, but in front of me was the most hiper realistic alien buda i ever "saw"!
Even more real than in the DMT realms, because there reality is pure light, and here it seemed to have some matter, but very light, not so condensed as our boddy, somewhat translucid..
And with an amazing neon aura surrounding him, morphing from electrical purple, to electrical blue, electrical green, and ultra violet, very DMT style!
I looked him/her in the eyes, and a very warm sensation invaded my heart chacra.
there was a comunication of some sort, non-verbal, really really deep, and i cant explain it because i cant create a concept for what was transmited to me there.
Then it faded away, and when its completely vanished, i feel as lucid as ever.