Here is a comparison of the first and second printings of the Cherifien Post stamps:

First on the left and second on the right.
Note the larger margins on the second printing, and the overall sharper look to the printing.
The unissued Ukraine set, often referred to as the Vienna issue, is discussed and pictured in this thread:
https://goscf.com/t/9204Scroll down the first page to find the start of the discussion.