Audio and video cables can be changed intercheangeably. There are many manufacturers who's video cables are the same as their analog and or digital cables.
From what I have read, audio cables are more sensitive to differences in such things as shielding and dielectic. So whereas you would find people who believe that unshielded audio cables produce a better sound, I have never heard/read of any videophiles who thought an unshielded video cable produced a better picture. As long as the cable is properly shielded, it'll generally work well as a video cable. The dielectic used also affects audio more than video. For instance, you'll probably hear more difference with a teflon cable than a foamed PE than see a difference between the two. The only thing I would be careful with is using digital cables in other applications. Some digital cables simply don't seem to work as a video or analog cable.
From what I have read, audio cables are more sensitive to differences in such things as shielding and dielectic. So whereas you would find people who believe that unshielded audio cables produce a better sound, I have never heard/read of any videophiles who thought an unshielded video cable produced a better picture. As long as the cable is properly shielded, it'll generally work well as a video cable. The dielectic used also affects audio more than video. For instance, you'll probably hear more difference with a teflon cable than a foamed PE than see a difference between the two. The only thing I would be careful with is using digital cables in other applications. Some digital cables simply don't seem to work as a video or analog cable.