Yes, digital cables such as ethernet cables and usb cables can affect sound quality just as much as analog cables. It is easier to discern in a high resolution room.
Power cables don’t matter if you have a high quality power conditioner. It just needs to have sufficient shielding to prevent noise from leeching back on your run from a conditioner to equipment.
Has anyone had experience with the effect, if any, of alleged higher quality Ethernet cables on sound quality in audio rigs where these cables are required, e.g., with streamers, digital ttansports, etc.? I am skeptical, but I was about power cables too but that disappeared soon enough