OW, Arkhangelsk, I'm afraid that Italians will not going to have their nice Horn Africa colony. You forget that Pasha said about Egyptian Empire, that it also included all of African Red Sea coast, and it was only abandoned by Egyptians due to British pressure. No such thing happened in TTL, so all of Eritrea, Djibouti and even some of Somaliland would have already in Ottoman hands before the Great War. Only the rest of Somalia are available to Italy. While they will likely going to attempt to conquer Ethiopia from there, it will be quite harder compared to doing it from Eritrea, which is much closer to Ethiopian center of power, and thus pretty doubtful that they will be successful in that. I'm not sure Ottomans will like an Italian Ethiopia, too....
Also, I forgot one thing, after gaining Sudan, it would actually be inevitable that the Ottomans will head west to check French colonial expansion. More over, Bornu at the late 19th century placed themselves under Ottoman formal vassalage, much like what Aceh did. It was the time of Pan-Islamism being so in, so ITTL Ottomans, which is stronger compared to OTL, will going to embark on adventures of saving Islamic states here and there from European colonialism.
They don't have to be successful in liberating all of them though, for the time being at least. However, at minimal Ottoman Sudan will be a tad thicker compared to OTL British one, even if they won't manage to liberate Lake Chad from French onslaught.
Also, Zanzibar should have both Tanganyika and Kenya, and actually a bit more of southern Somalia, and some of the eastern Congo, too, should be under Zanzibar sovereignty and thus British influence. Not sure about Uganda and Katanga, but both of them are likely to become Zanzibari as well, at least formally until railroads are established there...