This summer, in Paris, I picked up two old reprints of Alex Raymond's Flash Gordon comics (pictured on the right), and a few days ago I bought the new, stunning reprint from IDW (on the left). And the difference is just staggering. Not only were the panels rearranged for the old edition, but the colors are horrendous and the text is actually slighly different between the two! I have no idea why, but there you go.
But, worst of all, the panels in the right-hand edition have actually been recropped from the original. Pay attention to the first panel, which has been cropped, and the panel with Zarkov in his lab, which has been extended.