usually there is a little tab on once side so it won't sit right if you try to put it in the wrong order. Not going to break anything if you do it wrong and have to retry, you shouldn't be plugging it in while power is going to the PSU anyways.

I know, but my question is what if both sides fit the sockets? For example, the cable that connects the gpu and the psu is one side 8pin and the other side is 6+2pins. Is there a difference between putting the 8pin side to the psu and the 6+2pin side to the gpu and vice versa. Can i take it as I would be fine as long as I can fully plug the cables into the sockets