Yes, when installing the product you will have to remove a green piece to allow you to use both at the same time, but their systems do allow for them to both be on.
On this trim it allows you to adjust the temperature with the bottom control. The top control will allow you to adjust the volume control as well as divert the water.
The bottom rotates to control the temperature, while the top rotates to control the volume and divert the water.
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.