Can a 75 ohm digital rca cable be used in place of a regular rca interconnect?

There was a time when I use to use a Nordost RCA Valhalla cable as a digital cable and it seem to work fine at the time. At least until I was able to save up for a real digital cable. 

I'm thinking more the other way around. I want to use the digital rca that I have in place of an rca.

You can use your digital cable as interconnect.

I did that yesterday.

My regular Audio Note interconnect got some hum due to some internal issue.

I had replaced it with Silnote Audio Morpheus digital cables with good result.

in theory a digital cable may have a higher nominal impedance than a conventional rca audio cable; the extent to which you can hear the difference is another matter. i've used 75ohm digital cables as a 2ch audio interconnect (and likewise used a rca cable as a digital interconnect) with no ill effect; i do understand that the differences are more perceptible in video applications.

Interesting... so if anything bc of the impedance it might lower the volume/signal?