The difference is that the full back has committed to two seasons instead of three. That means he will be there until 2023 instead of 2024.
Nacho is about to renew at Real Madrid. Two media outlets are now reporting about the agreement between the full back and the board. 'Goal' reports that they were close to agreeing to a deal until 2024 and, now, 'Cadena SER' reports that they just have to make the news official. It will finally be a two year deal until 2023.
It might be that this change has come about after negotiations between the club and the footballer's agent. The club have decided to make cuts during the transfer window and with regards to their footballers in the market.