Stereo interconnects are usually 75 ohm and digital audio interconnects are usually 60 ohm, so there is a difference.
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As I understand it, digital coaxial cables are 75 ohm and digital AES/EBU (XLR connectors) cables are 110 ohm. That said, I have used half an analog pair cable in place of a digital cable at times and it can work fine. Whether the digital coax or the analog sounds better in your system will be for you to decide. I use the AES/EBU and it sounds best to me.
In most situations, you can interchange an "analogue" interconnect for a "digital" cable without major problems. Having said that, one may run into issues with increased jitter, poorer sound, RFI, the inability of the transport to synchronize with the DAC ( won't go into "lock" mode ), etc... Most of this has to do with shielding ( or lack of it ), signal leakage, digital reflections i.e. "VSWR", etc....
If you've tried a specific cable, it works between the transport and DAC and you like the results, it doesn't matter whether the cable was marketed as "digital" or "analogue". It's simply passing signal and the mating circuitry is stable enough to deal with it. Sean
PS... the standard for a "digital" RCA cable is based on an appr 75 ohm figure. Balanced / XLR is based on an appr 110 ohm standard from what i can recall. Analogue based RCA's can be anywhere from 50 - 100 ohms or so.