Nature is that which occurs independent from the particular intentions of individuals or the particular configuration of society.
Human societies occur within nature. We utilize and transform facets of nature toward our needs and ends. That which we create or produce is not natural.
In various societies, members tend to express different behaviors, are subjected to different experiences, and have different roles and relationships.
At any rate, the distinction is not required in the immediate context. I am now repeating for the third time that the distribution of an item or class of item within a system is not the same as its intrinsic attributes.
Every skill is different from every other qualitatively.
Skills are not related by any natural ranking from their intrinsic attributes.
Their distribution across society is not a natural consequence of their intrinsic attributes, but rather results from processes that are social, relating to accessibly and desirability for individuals receiving training.
Social processes are not natural, because they occur in society, not in nature.
I am sorry that you are feeling confused as you try to follow, but further simplification would be impossible.