So far as I can see Nargajuna does not attribute any inherent existence to anything including the Dhammas. I am new to these comparisons but is it not true to state that this is in contradiction to the Madhyamika view that all phenomena INCLUDING the Dhammas are empty of self.
In terms of a brief description of the Prasangika view, I am not as qualified as others but I would say that it take Not-Self to a greater degree than any other school and in this context further than 'Classical Theravada'. There is nothing anywhere ever that can be reduced to a self not even the Paramathma Dhammas. My understanding is that this is not seen as the case by those who study Theravadin Abhidhamma?
I personally don't see how having understood how one phenomena is 'Empty' how this can possibly NOT be the case for all other phenomena...but I am of course happy to be corrected