In fact, the only element vaguely similar to Ethiopian architecture in the current African set (Imperial Age) is the use of blocks and recesses and the stone texture which, for unknown reasons, is gray.
Ethiopian architecture is not only very different from that of Mali — which is not surprising, given that the distance between Gao and Aksum is greater than that between Seattle and New York or Lisbon and Moscow — but it is even distinct from that of the Somalis and Nubians around it.
You can see the architectural differences in this post of mine.
I also made a map that expresses what would be the best grouping of architectures, if we could add/split more civs. However, as you can see, the Ethiopians would still not have a parallel with anyone.
