I tested Urbane Bronze and to me it just looked like a brown that is faded and dirty, so I went with a real brown and will let the sun/weather do the fading over time!

The accuracy will depend on many factors and the person doing the color matching. Unless they make you a sample board upfront, you will have no way of knowing how good the color match is, until you get the door. You'll be stuck with the door at that point.

What is the door made of? How are they applying the factory finish? The frame to be wood? What color will that be? Factory finished as well? Why Gentek? I am not a fan of the product but make them produce a finish sample for you to sign off on as the finishing process may change the finish color/sheen quite a bit.

On my computer screen, Urbane bronze looks almost similar to Gentek's Commercial Brown, which is one of their stock colours.