Every cab that I saw was lettered N&W, so, they did match.
If you mean by color, then, welcome to the real world. Not all units and cabs ever matched, it just depended on when the railroad wanted to overhaul the units/cabs as to when they got painted. Case in point, when the N&W merged with the Virginian (and other roads), they didn't rush out and repaint everything. They just left them as they were. Same with other roads.
Going in, I thought that you might have meant that the cab was of a different road name than the locos. I see that is not the case here. However, it did happen. The N&W had a deal with the Reading for a run through train from Rutherford, Pa. to Roanoke, Va. that used N&W power and Reading cabs.
