Pcie slots confusion

[Ahmet Boga]

So for my 'new' GPU I need 2 8pin pcie cables, on my PSU there's only 1 labelled, though there is another 4+4 slot.

the PSU is a corsair 750cxm, the sockets look like this: https://postimg.cc/VdHNS6dj

Specs online list it as 2 pcie plugs but the labelling is throwing me off.
Is the pcie & 4+4 interchangeable so I can run two separate cables thought them?

Thanks,