Congratulations, great find!!
But I must make a remark about this wagon's "differences":
Actutally, the green cover is the only difference when compared with the first similar wagons from the Western-theme.
As a kid, I had an early Western-version and the wagon-mould was exactly the same to yours with the green cover. Later on, the wagon-mould was somewhat changed (in the mid 80's I think) to the one you used for making the comparison.
I remember this quite well, as I had both versions of the wagon.