Final answer:
The primary difference between the myth of Orpheus and Eurydice and the story of Inanna is their cultural origins and their outcomes, with Orpheus failing to rescue Eurydice while Inanna succeeds. Orpheus' story also includes music, while Inanna's story focuses on her journey.
Step-by-step explanation:
The primary difference between the myth of Orpheus and Eurydice and the story of Inanna is that Orpheus and Eurydice is a Greek myth, while Inanna is a Sumerian story. Orpheus and Eurydice is a tragic tale where Orpheus tries to rescue Eurydice from the underworld but fails, while Inanna faces challenges in her descent into the underworld but eventually triumphs. Another difference is that Orpheus and Eurydice involves music and the power of his lyre, while Inanna's story focuses more on her journey and transformation.