Could I butt in the thread with an opinion?
Actually not merely an opinion but a fact I have seen in my own spiritual practices that may shed a little light on that entire left/right thing. The souls trying to adhere to the right path (I say try to adhere since there is no such thing as a perfect path through either-they are simply too mixed up in the real world) are trying to reconnect to the Source (or God, if you prefer the "official" terminology) while the souls trying to adhere to the left path are trying to develop themselves into new Sources (yes, that means that the left ones are trying to become Gods within separate creations of this one). That is the ultimate difference between right and left souls. I know, I know people have told you the left ones are evil spirits, Satan's spawn, whatever, but the cosmic reality has a lot to do with karma and its intentions and carrying it out rather than with Good and Evil.
If you are a right walker the goal is to minimize your karmic imprint to zero and live as far away of physical pleasures as possible. But then the Universe rewards you with a lot of spiritual pleasures and you also start serving as a beacon of such experiences to the ones next to you. This is why they also call it the righteous path-you abstain from more "simple" pleasures in order to get into richer spiritual experiences which you could share with others. You also make space for this light to touch everyone near you and ascend them when you go down that path. But the reunion with the Source and the full abstention of the physical come at a price-you surrender your capacity to shine as a Source yourself. Yes, I believe that is achievable, too. Yes, you can become a God, if you wish for it. And that is the left path. That is its essence.
Contrary to what the propaganda of the rightists says if you concentrate your spiritual development on the physical and want to know and when knowing-to permeate the physical-with your own Soul you could (which too comes at a great price for your Soul) gain such an attachment to it that your karma will go on a path towards infinity, instead of zero. But that process must be well regulated and extremely well observed. You are too prone to mistakes along that route. It's also much more steep, dangerous and requires the full potential of your Soul. But....in exchange you could pick a plan of another Universe, another creation and become its Source (yes, its God). That is what that path ultimately leads to. Yes, it is much grandiose than the right path but as you could see far more difficult and demanding. The real question is:
What do you want to choose for yourself?
And that is the crux of this form of existence, of this Universe, of this Creation-the chief reason free will exists is to make it possible for all Souls to understand the price of living-either abstain from suffering and the eternal karmic relationships it brings with it and go on to merge with your Creator, or.....become one yourself and understand to accept suffering forever-as long as you exist no matter what form your Soul takes but enjoy creation altogether and continue supporting it ad infinitum.
Did the question about the difference between the two paths became clearer now?