There are 6-7 types of Hallertau. Most Hallertau from Germany will be Gold or Tradition. Gold has the highest AA, 7-10%, T. 5-8%. Some Mittelfrueh is still around, and that can run as low as 1%, but it generally 3-4%. As far as I can find there is no Mittelfrueh grown in the US.
There's also New Zealand Hallertauer, which although it is a Hallertauer cross, isn't remotely like the other hops in this family.
So, the short answer is not much difference.
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