You could argue that they've probably done that to sell more cables though
You could probably pull up the PCI-SIG docs and have a look at them if you want a definitive answer, but from what I've seen the cable hasn't changed.
I tried doing this already but membership to review docs seems to cost $5,000 dollars…
Only @Hostile_18 has that sort of cash to blow!

Cablemod have been called out on reddit about this as 1 year ago clearly stated : As mentioned below, the cables themselves didn't change actually. This primarily is a change for the GPU connectors directly.
- MATT CABLEMOD yet a year later now saying oh we have new 12V-2x6 cables available to buy 
