I've just discovered that another Australian working dog was taken to the USA with the import of cattle & sheep from Australia, many years ago. It's the Kelpie but it has not been developed into another breed in the US (like the Aussie has been).
Kelpies in the US have their own site & you can read about them at http://www.kelpiesinc.com/WKworkingkelpie.htm
If you click on Colours & Descriptions, you will see Kelpies that are still the same as those in Australia where they originally came from.