A fellow audiophile did some research and relayed to me that the exact same vendor who makes the FI-15 Furutech IEC connectors has been making the Cardas brand ends, and if you open up one of each and compare their "guts," they are identical. The factory told him the composition and plating are identical.
However, both he and I noticed that the Furutech IEC end grips the IEC inlet on the component more tightly. Whether this is down to the molding, I'm not sure. Maybe the specs on the IEC end are slightly different. He couldn’t tell a significant difference in sound.
I have some late production Cross Power cords, some terminated with the Furutech and some with the Cardas termination. I personally find the Cardas brighter and the Furutech more organic, but the difference is subtle enough that it could be my imagination (and this was before I was told they were "identical."). At the same time, in audiophilia, we are often dealing with liminal perception, so I do not discount such subtleties. I have not done rigorous A-B testing, which can be challenging with Cardas anyway, as their cables do take some settling time. This was just my impression with using several of both cables over time.
He had also heard the Furutech C-11 ends (all copper, no Rhodium plating) with amazing effect in some other brands of cords. He bought the C-11’s from Parts Connexion, and sent two of his Golden Reference Power and two of his Clear Power back to the Cardas factory, paying to reterminate them with the C-11s.
After about 500 hours of break-in, the Furutech C-11 all-copper plug sounded noticeably better than the original. So, as usual with all things Cardas, long break-in is a key factor.