I do not know
where to get the leather cover other than at Fritz Hansen, but yes, it is the same frame. The only difference is that the Allan screws of the model you have go from the top (with visible screw heads) to the lower frame, whereas in the leather version it is probably the other way around because the heads are not visible. In any case you have no thread in the top frame. You will need some so the best thing is probably to get the next size Allen screw (European standard measurements are available with increments of 1mm.
Good luck!
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