Yeah it is interesting the difference between these experiences. But then some people's NDE's do seem to share some parallels with DMT experiences...like neurosurgeon Eben Alexander's NDE, in which he described riding on a giant butterfly whose wings were “intricately-patterned, alive with indescribable and vivid colors,” like a “Persian carpet".
Some of his experience:
"I was a speck on a beautiful butterfly wing; millions of other butterflies around us. We were flying through blooming flowers, blossoms on trees, and they were all coming out as we flew through them... [there were] waterfalls, pools of water, indescribable colors, and above there were these arcs of silver and gold light and beautiful hymns coming down from them. Indescribably gorgeous hymns. I later came to call them “angels,” those arcs of light in the sky. I think that word is probably fairly accurate...
Then we went out of this universe. I remember just seeing everything receding and initially I felt as if my awareness was in an infinite black void. It was very comforting but I could feel the extent of the infinity and that it was, as you would expect, impossible to put into words. I was there with that Divine presence that was not anything that I could visibly see and describe, and with a brilliant orb of light...
They said there were many things that they would show me, and they continued to do that. In fact, the whole higher-dimensional multiverse was this incredibly complex corrugated ball and all these lessons coming into me about it. Part of the lessons involved becoming all of what I was being shown. It was indescribable.
But then I would find myself—and time out there I can say is totally different from what we call time. There was access from out there to any part of our space/time and that made it difficult to understand a lot of these memories because we always try to sequence things and put them in linear form and description. That just really doesn’t work."
It is weird, but my one breakthrough DMT experience, at the time, it really felt a LOT like death, or how I would consider death anyway (a hard one to know I guess until it happens for real). I remember this very tangible feeling of an electric, glass shattering in my brain, and the logical part of my operating at the time was totally convinced that I had done myself in, that there was no possible way to come away from something that brain shattering...and a shattering that I both heard and felt at a very deep level when it occurred.
Whatever the case, NDE's seem to have MUCH more in common with OBE reports than DMT trips...the feeling of leaving one's body, the experience of going down a tunnel, of encountering other beings and deceased relatives, of merging with an all pervasive white light, with associated feelings of deep serenity...all these are reported with both types of experience.