Call AF and they will be flexible. If it is an award, they might be less flexible especially as the new flight is less than 90 minutes before the old one.

But make sure that you indeed wish to change.
If you spend an overnight in Paris, I find a flight arriving at 21:35 more convenient than arriving at 23:05 (meaning that you will not be in your hotel room before midnight).
I would hate taking a BCN flight at 6:10, meaning that you have to wake up around 3am or so. Also, there is a small risk that you might miss your connection if the BCN flight is cancelled or heavily delayed despite the plane sleeping in BCN.