Egypt and Kush civilizations had many similarities.
Both of them were situated in Africa. The former in the north and the Kush in the south. They both lived along the river Nile.
They both built pyramids, but the Kushian ones were very steep.
Both of them had similar religious believes and worshiped the same Gods.
Besides, they both used hieroglyphics as a way of writing.
Apart from the similarities, for hundreds of years their relationship was mainly based on economics.