Two historical manga based on the life of the egyptian queen Hatshepsut. In both works, she's both portrayed as an adult and as a child. The color of her eyes is also a subject put forward by both mangaka.
Even if in Aoi Horus no Hitomi, the mangaka decided to show off her more "feminine" side, her personality is still the same : she has masculine manners and always say how much she would have prefer to be born a boy.
Also, the setting is of course the same, and there are other characters who are present in both works, like for exemple Hatshepsut's scribe.
Historical manga with female leads, by female authors. (They both run in the same magazine, along with Otoyomegatari.)
Both are hidden gems that derserve much more attention, especially from fans of historical series.
The two manga's have very strong female leads, when it comes to fighting and fending for themselves. Both narratives show what its like to live in different religious time period were the struggles for women are very high.
Both strong women in royalty with ambitions and a great motivational drive. Upon reading one chapter into each of these you easily get a "similar" feel for both of these manga.
Biggest difference between the two is Song of the Long March is more Chinese culture and Aoi Horus no Hitmoi: Dansou no Joou no Monogatari is more Egyptian culture.