I haven't been able to find it in the books now. But an experienced (RB211) 747 Classic sim instructor told me (as I wrote previously) that for the RB211, there is a slight difference between 1 and 4 and four, because it is a triple spool and has a turning moment. But since it is not in the manual, it must be something he dreamt up himself then. I remember he mentioned it in regard to the certificated crosswind component the aircraft have to be able to remain on the runway, and that it did matter which engine it was.
Good luck with the interview in any case ...