The defining characteristic of Patch 1.03 was a shift toward realism and tactical depth:
Are you interested in how these changes specifically affected the or 1933 scenarios, or04 ? Patch 1.03 Darkest Hour
Because of these deep engine changes, saved games from previous versions (1.0 to 1.02) are with Patch 1.03. Most older mods also require an update to function with the new misc.txt and modifiers.csv structures. The defining characteristic of Patch 1