There is'not only the similarity between the scriptings but there are also common elements in the pottery of the two civilizations which dates up to the neolithic period :
Flat bottomed storage jar
Probably Gansu, Yangshao culture
Neolithic to early Bronze (circa , 3000-1500 BCE)
Buff-colored earthenware ornamented with appliques and black painted decorations
Cycladic spherical jug with spiral decoration from the same period