Hansgrohe only has 2 plants, one in Georgia and one in Germany. All of their products are either made in the U.S. or Germany.
The 04231000 will have thermostatic and volume control/ diverter functions. Meaning you can run two different functions with this unit. The 04230000 is thermostatic and volume control only. Meaning you would only be able to turn the water on or off to one function.