Oh PPB:Reboot is a whole game, it's technically a sequel because the characters reference what happened in the first PPB game (I kind of regret calling it "Reboot" cuz a lot of people get that impression but the word "reboot" kinda makes sense for the story)
The main difference is that now you can date the characters that you couldn't in the first game and learn a lot more about the Bureau who made the game.