Hi yes they can sound better because they have better clock circuitry, electro magnetic compliance and twisted pair transmission line termination compared to some other devices because of the environments they can be used in, and the high data transmission quality and reliability they offer. These Catalyst devices also implement IGMP snooping by default, which depending on home network and connected applications can improve streamer SQ as it removes irrelevant data and processing overhead from the streamer. Less processing and work tends to lead to better SQ.
Ultimately it’s the switch’s interaction with the directly connected device or streamer that counts.
This is from default… there are other things you can do to optimise SQ, especially first gen Naim streamers if you programme them.
However with all these removal and changing of electronic noise, it can make the sound ‘purer’ but it is not always preferable, especially if you have grown accustomed to the added noise shaping effects of previous devices/switches.
I think Charlesphoto above made a similar observation.
Finally there are different 2960 Catalyst variant each with the option of producing subtly different SQ in some streamers.
The best network is one that works optimally for the connected devices including sending only relevant data for the connected devices … the Catalyst switches are a step in that direction with group data management.