I guess I already know the answer to this, then, but does that mean that 3 ranks in Perform (Dance) will allow me the defense action bonuses that 3 ranks in Acrobatics does?
Unofficial errata says no - if it says Acrobatics ranks, then you need Acrobatics ranks. (Source.) However, you should pretty much never be using that bonus. In my entire Pathfinder career, I have seen someone fight defensively all of one time. It's not worth it in my opinion.
Reviewing Kalinn:
The Toughness hadn't made it into the HP stat blocks, so the numbers looked off. Fixed.
Not all of the blocks had the saves for DD updated. Fixed.