Jim, no difference in the actual firearms. The LE version is just a manufacturer slated package to be sold to First Responders at a discount. Details here : budsgunshop.com/qualified_professional_discounts.php

This is the same gun functionality wise. The only difference is the price and who can purchase it. Major gun manufacturers like SW make LE model handguns that they discount and distribute through retailers like buds, that are discounted models for Law Enforcement, military, and other 1st responders.
The 163504LE is one of those discounted models. More info on the Qualified Professionals discount, who qualifies, and how to purchase if you qualify here.
budsgunshop.com/qualified_professional_discounts.php