What does Atwood share with Austen?

On re-reading Margaret Atwood’s first published novel The Edible Woman (1969) I noticed it adapted the same structure as Jane Austen’s first published novel Sense and Sensibility (1811). How is this possible? What does it mean? In the first blush of discovery, I thought it was a classical structure but classical is a debased term with different meanings. On reflection, I now see Austen and Atwood both using the dramatic structure Aristotle describes in Poetics. How did this happen? #janeausten #MargaretAtwood