Bluetooth headset and Mic on different sample rate (44.1<>48)

Hi.

I just can't wrap my head around.

I am using a bluetooth headset right now. And a mic connected to a Canon M50 M2 through a capture card (for clean HDMI without loosing the cams features etc - also I hate the canon software...has issues too)
The mic signal then gets routed through the Nvidia SDK panel and output of this is then the Nvidia Broadcast. This is the required workaround due to the nasty issue that causes OBS to crash when using the Nvidia Audio Filter.

I have no dedicated soundproofed and aircon cooled gaming room yet, so this is necessary.

So for microphone audio in OBS I select Nvidia Broadcast. This has a fixed sampe rate of 48khz.

But my Bluetooth headset has a fixed 44.1khz sample rate.

So far so bad.

I have set the regular speaker output of Windows to 48khz.

Now where does the sound of games (+Browser/Spotify) are coming from and at which sample rate?

I don't want mixed sample rates for the stream as they can cause issues.

So what is OBS recording from the game and Browser (Youtube Music)/Spotify (for music in the background for the viewer)?
44.1 khz as my headset is my personal output or 48khz as I set the regular speaker output to 48khz or how is that whole sound thing working?

I don't get it.

And just in case it is mixed with my setup - which is more important to match with the OBS settings - the sound/browser audio sample rate or the microphone? I think the game/browser as it is much more audio data...? Right? Or irrelevant?

Sorry for long text. I struggle sometimes with English (not my native language) and want to make it as clear as possible.
 
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