Club Europe seat policy
Yes, it changes based on sold tickets in each class on outbound and inbound flight.
If you'd like someone to check, they will need date and flight number. Keep in mind, that this can change up to the last moment based on any late tickets, that the aircraft might get changed and that you are unlikely to be able to reserve the front row of economy (those are the seats that might get moved if the curtain moves) this close to the flight (and/or unless you have status).