Andy,

This is the last ‘47 I owned, a well used farm truck, all trim was the same interior color. How do you tell if 47-48 trim is original? You look for the extra screw tab and decorative top/bottom finish trim (eliminated in early ‘49) this had them, never painted over.
https://www.flickr.com/photos/advance-design_parts_co/8626467622/in/album-72157631870734114/
Trim piece.
https://www.flickr.com/photos/advance-design_parts_co/8129177743/in/album-72157631867396207/
Tab on surround.
https://www.flickr.com/photos/advance-design_parts_co/8331300940/in/album-72157631867396207/
A picture from ‘48, while not color, it is also not dark indicating uniform color.
https://www.flickr.com/photos/advance-design_parts_co/17056938478/in/album-72157651722976780/