Now I look again, the first pic posted appears to have the same wider spaced track arrangement. My '38 ag spec (or should that be hort spec?!) is used for ploughing so is set up in a narrow configuration. I believe - without looking at the book - there were four width settings achieved by various swapping of wheels side to side, inner hub to outer hub etc., in a vaguely similar way to adjusting the rear track of Fergie or Ford with GKN style wheels.
I've just noticed it seems to have a tray under the engine, the only one I've ever seen other than mine.
Does it run?