How does "North American" GJ differ from the Euro style?

I've been listening to Gypsy Jazz for over a year, mostly the European artists. When I heard a North American band recently (The Djangoners), it seemed that the "pompe" was not as strongly-defined and the bass "walked" a good deal more.

I liked their approach to the standard repertoire, but it got me thinking about whether there is a North American "flavor" of Gypsy Jazz that more experienced forum members can define for me.

Care to comment?