First thing that caught my eye was that the printer's info is not the same on both posters. The larger image says "Editions P.I.L.E. Paris"
The smaller image i cant read but it has much more info there.
Some other things I noticed was the more transparent, lighter shade of blue that was used in the upper right credits on the smaller image file. You can see thru some of those letters to the yellow background vs a blue sky on the other. Also, the art of the Indian to the right of Stewart's elbow is more just a brown 'blob' in the smaller image. It lacks the detail of that on the other.
That made me wonder if that one is a possible, later RR? Or could the smaller image maybe be not a 47x63 1P but the smaller, moyenne size? It also looks to lack the same fold lines the 1P above it has. But even if the one is the smaller paper size, both would have the same printer's info, if done for the same release, (I would think)?
T, are you able to make out the printer info on the smaller image?
I like the imagery, too.
It reminds me a little bit of Soubie but it isnt signed.