Which two stories wouldn't happen if they switched main characters.

As the title. Which two stories have protagonists that would be extremely likely to avert events of the other story, if they were to switch places?

A popular example of this is Hamlet and Otello, where it is said both tragedies owuld never happen if they were to switch places, as Hamlet would second-guess and overthink everything Iago tells him, thus never falling for his manipulations, while Otello would just go and stab Claudius before the ghost finishes speaking.