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I can tell you from doing work on this book for HL that things that have significant differences between the old and AvG version a new version is made and the old version is labeled with the book it comes from. Otherwise, things get updated. There is a lot of discussion behind the scenes on this.
For example, the Steel Falcon prestige class is significantly different between the AvG and the original Andoran book, so there will be two versions. The old version being renamed Steel Falcon (Andoran).
Something similar is done withe the Aldori Swordlord prestige class (in this book) vs. the archetype which has been around since the primer.
Most of the updates are tweaks to the language of abilities and done really affect their in game effect significantly.
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