yes but it is more fixed, ie a -10 MAY develop into a top player, but only with the right training/first team action. whereas a player with a PA of 180-200 will in all likelihood become a star without so much emphasis on regular action/good trainig. although players who have a set PA are usually a bit older and also better, ie they may have a CA of 120-150, meaning they are good enough for first team action already, and they may only settle for a first team place at a club, making it harder to keep them happy. a wonderkid with a -10 PA needs regular action to progress but doesnt demand it, leading many managers into the mistake of not playing them.