Here's another interesting read about connectors for 75 ohm cable.
http://www.bluejeanscable.com/articles/75ohmrca.htm
IMHO, the difference you heard between the two cables was greatly affected by the connectors and the length of the cable. A digital coax should be very short or at least 1.5 meters in length. There are numerous discussions about the length issue. I have actually done a comparison between two identical digital coax cables with one being a meter and the other being 2 meters. The difference in sound was basically the same as the difference you described.
http://www.bluejeanscable.com/articles/75ohmrca.htm
IMHO, the difference you heard between the two cables was greatly affected by the connectors and the length of the cable. A digital coax should be very short or at least 1.5 meters in length. There are numerous discussions about the length issue. I have actually done a comparison between two identical digital coax cables with one being a meter and the other being 2 meters. The difference in sound was basically the same as the difference you described.