The maps are identical.
As far as physical components go, the biggest change is the replacement of the cardboard AA guns with plastic AAA. That can be gotten around by placing control markers under the AA guns to indicate ownership. There were other changes, but they’re all cosmetic (new sculpts for the Italians, etc.), so they’re not going to impact game play.
There were significant changes to the rules. The areas of biggest impact were politics, AA guns, scrambling, placement of new industrial complexes, strategic bombing raids, and convoy disruptions.