Connectors are where the issue is and there is a difference even if they fit in the same plugs and power can still go through them.
From your link
> Compared to the original 12VHPWR connector, the new 12V-2x6 connector has shorter sensing pins (1.5mm) while the conductor terminals are 0.25mm longer
AIUI, the connector _on the GPU/PSU_ is slightly different, but the connector on the cable is the same:
> As with any new standard, things are likely to evolve quickly and we’re now seeing the introduction of a new connector on the GPU and the PSU side of things. To be clear, this is not a new cable, it is an updated change to the pins in the socket, which is referred to as 12V-2x6.
Corsair's messaging on Reddit[1] emphasises this:
> Cable is the same. a 12VHPWR cable is a 12V-2x6 cable. it is ONLY the plugs on the graphics card / power supply that have changed.
> The cable is the same. 12VHPWR = 12V-2x6. You will get the exact same cable if you upgrade to a new PSU.
> As mentioned in image one, the cable is the same. Only the plug on the graphics card / PSU changed from 12VHPWR to 12V-2x6.
That's inconsistent messaging from Corsair, then. Parent comment quotes the times they're like "ehh, they're same thing, don't worry about it" and then they go on to say "well TECHNICALLY there's a teeensy difference in conductor sizes"???
Either they are confident that the 0.25mm terminal difference is within tolerance enough that they consider 12VHPWR to be functionally equivalent to 12V-2x6, or they're getting themselves confused let alone the target audience of their article.
From your link
> Compared to the original 12VHPWR connector, the new 12V-2x6 connector has shorter sensing pins (1.5mm) while the conductor terminals are 0.25mm longer