I finally got around to seeing the square box edition today (I own the big box). I didn't have much time to inspect things, but things mostly looked the same. Differences were:
1. Typos on the board were fixed (the swapped "Oil" and "Gasoline" legend); this seemed to be accompanied by a figure/ground change (the text became black text on color background instead of color text on black background).
2. The economic sheets had an extra field, an up or down arrow indicating "economic trend". The apparent typo regarding rolling double-4s on Expansion (if you have the big box edition, compare the German side to the English side) was not changed.
3. The backs of the rumor and economic sheets didn't have the other language. Also, the paper seemed of cruder quality, so it's possible that what I saw was just a bad photocopy.