This set and the same dark green cars with a 9 boxcab are great looking sets in dark green.
As Terry noted they changed the window color from maroon to orange to identify the correct cars with the correct loco. If I was heavy into Standard gauge I would have both sets.
I have had the set with 380, but have never had the 9 set. I believe the set with dark green 9U Bild-a-Loco is uncataloged, as the 1929 catalog shows set 349 and 349E in orange, also 1930.