If the magazines are military, they should all work, period.
As has been stated, Chinese magazines lack the "reinforcement" ridge on the back of the magazine.
European magazines do differ in fit and finish.
The Romanian magazines that I've seen and used are generally the poorest finished, with a matte blue and rough edges all over the place.
Bulgarian magazines and some Hungarian magazines are the best finished in a black enamel. No rough edges on these either.
East German magazines are usually blued, in a gloss, and are very high quality as well.
Russian magazines can be either blue or painted.
I haven't run across enough Polish magazines to comment, but they are usually black phosphated/enameled too.