Chapters 1, 2, 3 and 5 are what-if chapters taking place in an alternate timeline, chapters 4, 7 and 8 are on the same timeline as the first game, and are therefore all canon events (with 4 and 7 simply being moments in the past we hadn't witnessed, and 8 resuming from the end of the 1st game), then chapter 6 is a what-if scenario taking place from where a bad end in the previous game left off. As a result, the only chapters that completely match up with the first game are chapters 4, 7, and 8. …