Depends on the ethnic group. The cushytics such as the oromo, Somalis and afar all have prehistoric eurasion admixture at about 30-40 percent(more than 12000 years ago) while Semitic groups such as the habeshas can have up to 60 percent eurasion and west asian admixture(4000 years ago)
Habesh
You're right but the difference between us is not that pronounced.
The people most representative of of the Old Cushytics are Somalis who are usually about 40%-45% Eurasian. Habesha groups have about ~8%-10% more admixture with Middle-Easterners and hence tend to be 50-55% Eurasian. Somalis out of all the horners tend to be straight up Proto-Nilotic mixed with old Middle Eastern Farmers/Pastoralists (from Sinai/Levant) which is what the Cushytic migrants to the horn from Southern Egypt were like. The Mixed Cushytics migrants to the Horn easily took over the horn because they were more technologically advanced than the hunter-gatherers who lived in the Horn at the time.
Habeshas on the other hand are mostly made up of the mixed Cushytic cluster (70%) with recent South Semitic admixture (South Arabian) and as well as Omotic admixture (which is found at 0% in Somalis)
Borana and southern Cushytics in Ethiopia tend to be 85% Cushytic and about 15% Omotic.
You'll sometimes see Somalis clustering between Boranas and Habeshas. That's not because Somalis are a mixture of those groups but that Boranas are Omotic mixed pulling them south to Pure SSA's while Habeshas like Tigrays have a slight northern push because of recent South Arabian Admixture. Somalis have none of both and hence cluster in the Middle. Habeshas also have Omotic admixture like Boranas (10%) but their recent Semitic mixture is more (20%)
Central and Northern Oromo groups are very diverse, Some are like Somalis, others are like Habeshas and Some like Boranas.
Boranas by the way are a southern Oromo clan who straddle between Northern Kenya and Southern Ethiopia.
To summarise for you.
Borana and Southern Cushytics = 35% Eurasian Ancestry
Mostly Cushytic (about 80-85%) with some Omotic.
Somalis & likely Afars = 40-45%
and are made up close if not 100% of the Cushytic cluster.
Habeshas = 50%-55%
meaning 70% Cushytic, 10% Omotic and 20% New Semitic.
Somalis and Afars live in a very hot climate unlike the cool Highlands of Northern Ethiopia hence the more darker skin but the admixture manifests itself it terms of morphology and Hair. Afars & Somalis tend to have the highest frequency for loose Hair in the Horn.