difference between Schlage G and Schlage H

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The center to center distance is 4 inches.
Schlage G Series template locate here.
The L-Series doors are designed for virtually all construction requirements in commercial building applications. They have also been tested and approved for uniform wind load per ASTM E330.  ...
The G-Series lockset was discontinued in 1981, and all service parts for the G-Series lock were discontinued in 1985. 
 The current interconnect lock, S200 series (available in levers only), will not fit into the same door preparation.