I went to school in Minnesota, and I think I know what they're talking about, at least when it comes to the math curriculum: we never had a trigonometry class. Sure we learned trigonometry, but it was never a dedicated class. Instead it was always a unit attached to what we were currently working on, whenever it made sense.
End result: we learned the same material, just in a different order.
End result: we learned the same material, just in a different order.