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From having had a large number of different guns over the years I know that this sort of measurement is useful in only a most GENERAL way and arguably has limited value.
The width of the grip (including the grip panels installed, and which may be changed), the depth of the grip (the distance between front- and back-strap), how high shooter is able to move the hand UP on the grip column (under a beavertail, if there is one worth mentioning), and even the WIDTH of the trigger are all factors that affect the USABILITY of a given trigger for a given gun.
(Other factors, such as takeup, and how the trigger moves -- pivoting on a pin, or moving back, as with a 1911 -- can also affect how the trigger finger is able to use/access the trigger, despite measured dimensions.)
Unless you can somehow take most of these factors into consideration, the dimensions being mentioned are numbers offered in a vacuum. Two guns with identical lengths of pull measurements could feel and function quite differently in the same hand...
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