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The front fender mount bracket is also different. I think that the '40/41 is repopped by someone for facilitate using the later cabs as a '40.
And...the 42-47 has an in-cab, under-the-seat gastank while the '40/41 is frame-mounted behind the rearend, so the floor under the seat is different (or missing! )
maddog200485, welcome to FTE, hopefully this thread will answer any questions you may have.
Simply put, as a whole, you can use the '40-'41 cabs on a '42-47 frame, and vice versa. There are some small detail stuff, but they interchange.