Historically speaking, NO.
They are two separate and distinct geographic and cultural entities.
When they were 'united' it was as a result of one kingship group overthrowing another.
'Egypt' itself was not only divided into two regions but there were two main priesthoods which were rival clans fighting to exercise sovereignty over another while the Nubians , ie Kings of Kush, sought to establish and maintain cultural and political autonomy.
Good info...Im enjoying the thread.