She does not say she modeled Catherine on any of these heroines of Cecilia, or Camilla, or Belinda. Catherine can be "the" heroine of NA [filling a role in the structure of the plot] but not "a" heroine [a type of personality] of the mold JA parodies.

(Of course, whether Catherine is the heroine of NA as we suspect may need to wait for further reading, since JA did use a kind of bait and switch with Jane and Lizzy in P&P.)

Of course P&P discussions need to move to that board or, if appropriate, Austentations.