The Xbox 360 and PS3 had their own cpu for audio, and on 360, there was XMA decompression hardware.
The switch hardware is quite powerful, but less cores, and in most games, the core is probably not dedicated purely to audio like the other consoles are?
You can set the console to 48khz if you want, and a mix of vorbis / FADPCM is probably wise, it is recommend you use the FMOD Studio profiler to see if your mix of voice counts and compression format is too much for your particular game or not.
Anything more specific to switch hardware should be directed to support@fmod.com as this topic is not meant to be discussed publicly.