I tried to ask the same question a couple of weeks earlier.
My experience is that there are certain characteristics that do change.
They change for better.
These are all the things that come from the back of the instrument - subtleties and overtones are more pronounced in my instrument after 18 months with me.
I attribute it to the fact that rosewood is a harder wood and needs more time to open.
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Nylon string are softer, but harder to play 
Alhambra 11P
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