I don't recall Durla being mentioned as one of the seeded worlds by Mon-El (Valor). In the original LEGION series there was a Durlan (later suggested to be Brande, who was swapped into the future for Phase). I thought the seeded worlds contained strictly human colonists with the Dominator-activated Meta-Gene.
Braal, Tharr, Bismoll, Carggg, Lythyl, Rimbor, Starhaven?, Dryad?, Titan?, some others.
Legion homeworlds such as Durla, Talok VII, Colu evolved with their own unique lifeforms. The timing of the six-minute war on Durla coincided during the 20th century on Earth. The true forms of Durlans before and after the event are subject to speculation and depend upon which version of tale you care to believe.