i think that it is hard to define. in general, both fall into the same family of being a child-lead or relationship-based process of education, stemming from the fact that the family likely holds this process throughout their family lives.
that is to say that really, those who live in a child lead, or relationship-based process, for family life, also extend it to education.
some people lead a child-lead, relationship-based family life, and choose to educate their children with a variety of schooling methods. some people choose a child-lead, relationship-based family life, and choose to follow that with education, and also choose to have certain 'family rules' to make the family 'function' properly. and some people choose to just go with the child-lead, relationship based process in every way they can possibly fathom.
i don't htink any of these methods are 'wrong' in any way. they are just different.
in our family, we are child-lead and relationship based, but we are also following many elements of anthroposophy in the home. we use rhythm predominately, as well as those theories regarding how a child develops (or more appropriately, incarnates), and this asserts a great deal about bed times and meal times and so on. it focuses on family meals and celebrations as well. i believe that it makes our family life easier, though i don't see them as hard and fast "rules."
at two, my son has certain sleep needs that i'm aware of, but there are times when he is "off rhythm"--usually with a development--and so our rhythm adapts to him. i still strive to keep the bed time somewhere between 8 and 9, and we had it moved back to between 7:30 and 8:30 until we went on a weekend vacation and he was on a plane during his normal bed time. he got so psyched by the adventure of hte air plane and the new environment of the hostel that he was up until 10 just bouncing off the walls, btu slept until about 9 am anyway. lol!
anyway, i'm just saying that while it may not be defined in a 'radical unschooling way,' i think it comes from the same impulses of child sovereignty, but is also infused with a lot of other philosophies and life experiences and such that his father and i bring into the relationship with him.
now, i'm rambling. LOL