For those interested, this is the reply from the PFA.
"They are different awards and unrelated to each other (except for the fact they are both named after a legend of our game).
The A-League Men award (just awarded to Connor Metcalfe) is voted on by the broadcast commentators for on field performances.
The PFA Award is more of a lifetime achievement award and based on a combination of the following factors: leadership, achievement as a player, commitment to one's fellow professionals and service and dedication to the game."
So there we have it "from the horse's mouth" so to speak.