From Nick Land’s place:
Alt Right is the literal and figurative muscle of the dissident right.
NRx is the elite theoretical wing.
As adobes of different social classes, they will never be chummy. But if NRx is to ever to grace the halls of power, it will be on the heels of upheaval wrought by the Alt Right.
This isn’t completely right (much of the Alt Right might object to certain NRx ideas), but it’s in the right ballpark.