The only difference I can tell is that the stamp at left has a guide line.
The guide line might be of some interest to position collectors or those trying to plate the whole sheet. However, for many collectors, the natural straight edge at the left side is considered undesirable.
There are no listed variations on this stamp in Scott's Specialized nor in Sanabria's Air Post catalogues. Listed C9 in Scott, 6 in Sanabria.
The Guide line is the the edge of sheet also leaving the stamp an imperforate edge. These stamp was printed on plates of 200 divided into panes of 50 separated by guidelines then machine cut so they can be sold in panes of 50. So your stamp is from the right side of the original plate, and the left edge of of both right side panes. All in all 10% of this stamp will be found in this manner, yes a variation but not one widely considered significant.
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