HR against CEO
In an interview in a large group, so you'll be confronted with recruitment experts, who occupy the HRD function and whose job it is every day. In comparison, the hiring process in a startup is very different. It is rare that the startup has a team dedicated to recruiting except when it is growing exponentially (type BlaBlaCar or Criteo).
Generally, it is a founding member who will be responsible for conducting the interview. According postuliez you for a startup or a large group, so the interview will take place not in the same way, it will be to you to adapt your speech according to what your partner expects. Indeed, a CEO will focus more on the business and operational part while an HR attempt to dig more on the consistency of your professional and academic background.