Notions of fairness as pushed by the exploiting classes are based in falsehood, fancy, and fakery. Whether it is explicit caste saying an entire group deserves their "lesser" position or more fluid notions of what one deserves, such as through individualist narratives to do with personal responsibility, the capitalists, the imperialists, the colonizers: they all look for ways to justify their exploitation as fair and just.
Sometimes they use religion as a means of validating, laundering, and sanctifying these narratives, teaching people that they will get what they want by being "good" and not get what they want by being "bad". These notions of "good" and "bad" are, for the exploiting classes, defined in the manner which is most convenient to continuing their exploitation. Violence is presented as bad when it challenges exploitation and presented as good, as self defense when it protects systems of exploitation.
This produces people who suffer all the more when, upon experiencing hardship in life, they struggle to understand "why me." I, they think, "did everything right." I "did what they said I should do yet still I suffer." It can bring on a sort of nihilist defeatism. "If I did everything I was supposed to and still suffer, then what was the point of all this?"
Revolutionary fairness, or we could call it liberation fairness or communist fairness, is different. This kind of fairness is rooted in human need and logistical efforts toward getting needs consistently met. Revolutionary fairness may sometimes mean rationing few resources among many, but it is not inherently about impoverishment or scarcity.
A revolutionary entity that has advanced resources can produce more advanced outcomes for people. Rationing can transform into dramatic gains in quality of life.
It is worth noting that an exploitative entity can have an abundance of resources and still engineer scarce conditions for the masses, under which they experience avoidable hardship simply because the exploitative dynamic demands that they do. This is sometimes the case under modern capitalism, such as when grocery stores are full of more food than people can buy and eat before it expires, while some are going hungry. Or when housing infrastructure is there to house the people, but due to the exploitative mandates of private property and the landlord, some are homeless.
So, the difference between bourgeois fairness and revolutionary fairness is not "how much resources they have." The difference is in how they use those resources. Revolutionary fairness going through famine will do its best to ration fairly and work hard to overcome the problem. Bourgeois fairness sitting on prosperity will make some suffer and blame them for their position of suffering. Revolutionary fairness with prosperity will uplift millions in quality of life. Bourgeois fairness going through famine will hoard resources for the wealthy and seek to use military force to crush unrest.
In other words, bourgeois prosperity is prosperity for the exploiting classes. Revolutionary prosperity is prosperity for the masses. So, bourgeois fairness isn't fair at all. It is only through revolutionary fairness that we can actualize fairness for the masses.