So, fabroni posted the new challenge and I am here to contribute!
My choice was Persia/Iran, which is divided after a POD in the year 1946 between the Soviets, who don't want to go, and the British, who install a puppet dictator.
The first flag, the Flag of Nothern Persia / the People's Republic of Iran is a tricolore spotting the Pan-Iranian colours, as well as the classic hammer and sickle, as well as two stars, showing the Soviet backing of the government.
The second flag, which is used by Southern Persia / the Free Republic of Persia is more complex, while overall staying in Pan-Iranian colours. In the center, there is the faravahar, showing the cultural roots of the country.