Need help identifying shower hardware

Here are a couple of pics. Thanks in avance for the help!

Now, if we had a picture of the part in the wall behind the trim plate, we might be able to answer the question.

The black part is grohe I believe. Does that guarantee that the hardware is the same brand?

The cartridge is of course Grohe. Some companies provide valves to aftermarket "foo-foo" designers who provide the trim; I don't know if Grohe does that. Someone may recognize that logo just above the word "warm" on the plate. In any event, you do have 3 chances to get new trim....slim, fat, and none. But since based on the "modern" finish, I presume it is not so old, so there may be some grohe stuff that would work. Be aware that Grohe, and Hansgrohe, are two completely different companies.