The soul needs many, many lifetimes to complete it's evolution here on earth.
It's pretty difficult for me to say if some tribal people would be in a lower stage of spiritual development.
The evolution on earth, as I understand, is kind of a funny thing.
When the soul arrives here on earth it is forced to follow a certain way across all tribes and people until the end. During that first 'push' the soul naturally makes mistakes because of the unawareness of cause and effect.
So when that first push has completed the soul then returns to whatever tribe or people is needed to start making up for what it did wrong in the past, to make up for the cause and effect.
So that means that any kind of tribe or people is always a mix of people who are in various stages of their individual evolution. Some are in their first push, others are making up, others are making up for what they did wrong after they started making up...
In general you might say this tribe has a lower stage of evolution and that people is more developed. But over time man has made such a mess of it's evolution that in many cases there is hardly any difference anymore in the general conscious of many peoples across the earth.
Bluntly said: people have surpassed themselves in stupidity and egoism to a level that even God had not foreseen, but everything they did wrong must be made up.
But that is only for this planet. This planet has the right level of development for human beings for that to happen.
I think that on other planets before earth living creates consume meat too.
I believe there is a specific path across the universe that every soul must follow in order to reunite with God. So there are no other planets with the same level of evolution like here on earth.
There is also a kind of cause and effect on a few previous planets, but the conscious overthere is way premature. So the karma that an individual develops overthere is more limited.
On the next planets after earth all human life has developed love and light to such an extent that they have all become vegan. Their level of love and awareness makes it impossible for them to disrupt the harmony they live in and eat animal food anymore. They have a free choice to do so of course, but because their conscious is so highly developed they just don't do it anymore.
Animal food doesn't fit with a higher level of awareness and love.
So as long as you and I have not developed love and awareness to a higher level we will not go anywhere and stay comfy and safe on this little spot in the universe and work on our evolution...