I tend to see Propertarianism as Post-Neo-Reactionary. Although, it may be more accurate to position NRx as a rationalist program in the continental and moral traditional, and Propertarianism as an analytic program in the anglo scientific tradition – but both making the same criticism: the evolution of the cathedral, the failure of the enlightenment program, and the necessity to return to modernity (science) and away from postmodernism (pseudoscience, cosmopolitanism and neo-puritanism).
The most important difference is that Propertarianism is not so much reactionary as it is revolutionary. In that literally I am working on a program to cause and justify a revolution. However, I don’t recommend a return to the past at all, but an evolution of the classical liberal model of government that serves the wants and needs of post-industrial individuals, families (or lack of), societies, economies.