Greek myths are purely fictional; made-up characters, places, and battles. Roman myths combine reality and fiction to create a story that Romans can relate to their history.
In the Roman Empire, the church and the state were one so state service was equivalent with religious service
The Romans deified their leaders for practical reasons (such as evasion of death), unlike how the Greeks deified people for little or no reason.
In the entire myth there are only three women. One of the three nameless, another is raped, and the third is not even human, she is a wolf.
Similar to the story of Moses when he was sent down the Nile as an infant.
Similar to the story of Cain and Abel when they fought over their sister for her hand in marriage.
The myth of Romulus and Remus states that Rome was chosen in an area with seven hills and seven birds circling the sky. An Aztec myth states that their city was chosen in an are with an eagle pearched on a cactus with a serpent in its beak.
Also: immaculate conception. This was chosen ofer the original conception of Romulus and Remus, which was the rape of their mother. An immaculate conception was also featured in the story of the birth of Christ.
Versions were altered to fit the needs of politics and cultural pride.
The Romans borrowed many ideas from the Greeks and adapted them into their own culture.