Just did a quick comparison and the stars revealed the following pattern:
Novice poster 1 yellow star
Junior member 2 yellow
Asst. member 3 yellow
Supporter, Senior member 4 yellow
Charter, Senior 4 yellow
Supporter Asooc member 4 yellow
PSR Performer, supporter, senior member 4 yellow
Assoc member 4 yellow
Psr performer, admin, senior member 5 redish gold
Assoc member 1 green
Global moderator, senior member 3 green or 5 purple
psr performer, senior member 4 green
Senior member 5 yellow
Did not go any further.
Jerryghr