Not that anyone would notice unless they had the images side by side, but the graphics on the side of the Caboose is clearly different that the ones used on the other cars cars (and in the Carolwood Society graphics).
In the picture below I side by side a graphics from one of the freight cars I took in Sacramento next to the Caboose I took. The graphics on the freight (and other cars) has a heavier/bolder text and stroke to the lines, circles, and other graphics in general. There is a bit more fine detail in the Caboose stencil. Also the cab windows and the headline are bigger (more clear area) on the Caboose version.