How does the narrative structure of story mode differ from red dead redemption?

The verified evidence details Red Dead Redemption 2's narrative structure as a linear, prequel story set in 1899, following Arthur Morgan and the Van der Linde gang through an open-world action-adventure framework. It emphasizes first- and third-person perspectives, survival against government forces and rival gangs, and gameplay elements like shootouts and horseback riding. However, the evidence contains no information about 'story mode' as a separate game, mode, or narrative structure. Without additional context or evidence defining 'story mode,' a comparison between its narrative structure and Red Dead Redemption 2 cannot be accurately completed. The question may require clarification or supplementary sources.