Thanks for the reply, I came across these Silverstone cables (which of course we cannot buy here (at a reasonable price)) and they state that both the P and PT are compatible with them, that's why I thought maybe the ones that come in the boxes might be the same.. :)

Grab a multimeter or physically trace the cores.

This was easier when everything was colourful...

Well I ended up checking it the best way I could (no multimeter) - and then decided to swap out the 2 GPU 8-pin cables..

Everything seems to be running fine :)

 and under load