Here's Indy outside the temple in Peru. He's in the shade, where the lighting isn't so good, so the hat has a dark chocolate brown color to it.
Now, here's my Adventurebilt, which I moved back from the light a little to have the same look to it. It is also very chocolate brown in this pic.

Now, here's Indy with some better lighting on his hat:
Here's my Adventurebilt, with the flash of the camera hitting it in such a way that it ends up looking similar.

Notice how all three of these pics look like Indiana Will's hat?

One more set.
Here's Indy inside the temple in Peru, where there is barely enough light to shoot, much less to illuminate his hat.
Now, here's me in my Adventurebilt at Comic-Con, where the lighting wasn't much better when the picture was taken from a distance. The color is very similar.

Now, here's Indy in the Cairo street fight, in direct sunlight. The hat looks much lighter here.
And here I am, in direct sunlight as well. Notice how similar the colors look, and how dramatically the color changes when out in the light, as opposed to being inside.

See what I mean?
Regards,