What is the difference between the ND50 and ND53?

ND50PD (ANSI F82) Entrance/Office Lock 

Push-button locking. Push-button locks outside lever until unlocked with key or by turning inside lever. Inside lever is always free for immediate egress.  

ND53PD (ANSI F109) Entrance Lock 

Turn/push-button locking; pushing and turning button locks outside lever, requiring use of key until button is manually unlocked. Push-button locking; pushing button locks outside lever until unlocked by key or by turning inside lever. Inside lever is always free for immediate egress.

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