Hardly any, really.
5-MeO-aMT has a much higher bodyload, the body high alternates between euphoria and dysphoria, the mental trip is completely different, and short of smoked DMT, its the most insane hallucinogen I've ever done once you get the dose high enough.
Careful with it though... its extremely toxic and I truly regret abusing it like I did. The visuals were just too good to pass up but looking back, I could have done much better without doing it so much and I probably would have enjoyed it even more than I did.
I seem to be out of the norm. I, personally, didn't find it to be all that bad at lower doses and always had a blast in the end, no matter the dose (except for one time that I received it in place of AMT... my dosing of AMT being usually in the 50mg range, I didn't even think twice before dropping 40... ended up in the hospital a few hours later with my heart rate at 190, my blood pressure and 191/97, and my entire body going number and number by the second - I shudder just thinking about it and I haven't touched 5-MeO since. Its just not worth it and I could have died that night) but the comedowns were always nasty and filled with headaches, residual stimulation that lasted for many hours after the visuals went away, and a discontent with the world as I knew it along with an urge to eat more to bring it all back.
I have an addictive personality so take this with a grain of salt but I definitely formed an addiction to it and continued to take ridiculous (eyeballed most of the time) doses for many months up until I finally pulled myself back... hadn't done any research chemicals in a long time when I ordered that "AMT" and boy what a nasty experience.