If you alone have satisfied the condition of a Destiny Card in your possession, you have completely fulfilled your destiny and score the larger Glory bonus. If you are tied for the condition you have only partially realized your potential and score the smaller Glory bonus. You must have at least 1 of the required items to satisfy a Destiny Card.
You may only score Glory for your own Destiny Cards. Fulfilling or tying for another player's Destiny Card provides you with no Glory, it merely prevents them from gaining it.