From the earliest Kings of Ta-Seti to the first Dynasty King of Kemet this link is a good place to start In this link they touched on possible linkage of the Uruk motifs they considered were acquired through long distance trade and re worked to fit Nile valley but this was no master race theory at work here. Certainly the Egyptians were initially inspired by the iconography of late Uruk and Elamite glyptic - cylinder seals, which they knew through long distance commercial contacts; but they re-elaborated and manipulated these visual metaphors according to their own ideology: later in Naqada III another similar motif, that of the two 'serpopards' with their long necks held with ropes, recurs in the central register of the Narmer palette obverse. It has been advanced that this would have the same value as the later fusion of the Upper and Lower Egyptian heraldic plants which symbolized the Union of the two Lands.
Evidence of the first Kingdoms on the Nile in Ta-Seti today's Nubia In Both Egypt and Sudan Click the link use at will