I came up with the following distinction and would like to hear a second opinion.
Green sees that everybody has their own point of view and sees them as a part of society that should ideally work towards a common goal.
It sees that everybody is essentially equal by the virtue of emotional response to transgression of personal values.
It tries to harmonize and align their value systems so that they can account for everybody else in cooperation.
The means through which it harmonizes people is by subjecting them to common good, the society.
It is different from blue in the sense that rules of said society are not established by authority.
The rules are established as the path of least resistance through various value systems and optimize mean happiness of an individual.
They are not good or bad in the absolutist (blue) sense, but are at best good enough. They are established by consensus.
Yellow on the other hand sees that not only everyone is equal in the green sense, but also every single one of them is always, strictly speaking, right.
It sees that there is no common ground when it comes to comparing perspectives. Every single human has his own, disjoint world.
A perspective is a self-contained universe that responds to stimuli in a way that makes sense for this particular perspective.
When one person speaks, the other hears his own interpretation. The interpretation that is predicated on his perspective.
When Green tries to subject Red to common good, Red sees common good as something else than Green.
They may even agree on what to do (verbally), but go about it in opposite ways with benevolent intent.
It makes no sense to judge Red from Green's perspective. All perspectives are disjoint.
The key difference is that Green fails to see this crucial distinction that there is no common ground to compare perspectives.
You cannot put people on a single playground and expect them to follow common rules, as they understand them differently.
You have to treat each person as playing its own game, and construct society as a mechanism composed of different (living and feeling) parts.
That's a whole different level of complexity that requires systemic thinking.