> Before to try to use KML i need to know if it's possible to change an
> options of a single polygon in a kmlLayer (like change color).

http://code.google.com/apis/kml/documentation/kmlreference.html#polystyle

But if you mean to change the colour after the KML is loaded, I do not
know of a way to do that if you use kmlLayer.

> Every polygon have a unique id.

No problem
http://code.google.com/apis/kml/documentation/kmlreference.html

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