I found the photo and reference to one O&W NW-2 that gained the dual cab windows on the NYC. It was NYO&W 123, then NYC 9508, NYC-PC 8691, and Conral 9268. CR retired it on June 11, 1983, and traded it to EMD on an SD-50 order. The photo on page 77 of Bob Mohowski's "New York, Ontario & Western in the Diesel Age," was taken at Collinwood on October 12, 1968. The 8691 was still lettered for NYC, but it had gone through the NYC renumbering of early 1966 in preparation for the merger.
It is possible that the entire cab might have been replaced, because it also has two steps in front of the fireman's door, instead of the one step used by the O&W. Or, maybe the NYC added the step and changed the window arrangement.