You will have to try it and see (hear). The cable may sound good or it may not. It will carry a digital signal no problem at all. How well is unknown until you try it. If they just happen to be 75 ohm cables, then you might be in luck...
Any difference using RCA for Coaxial Connection?
I have a pair of Harmonic Tech ProSilway MKII RCA interconnects and my Jolida JD100 has a coaxial output. Will I hear any difference if I use a true Digital Coaxial connection or will the quality and shielding of the Harmonic Tech ProSilway MKII RCA interconnects be the same?