The pinouts on the PSU side of the cables may look the same between PSU. However, that end is not standardized. They use proprietary pin configurations which often aren't even the same between different models from the same manufacturer.
Only the end of the cable. The component end is standardized. Floppy, 4 pin Molex, PCIe, EPS, CPU, ATX, &c
Can you use the cable?
You would have to place a multimeter at the component end. To make sure the voltages and grounds on the component end are going to the correct pin numbers. If this is wrong you'll fry the part(s). If you are certain about your technical abilities to use a multimeter and move the individual wires to the correct pins. Then you can use other cables.
Also some manufacturers add an in line capacitor to their cables. You'd have to add, change or remove the capacitor. Depending on what your PSU requires and what the cable includes.
So, even if you do find aftermarket EVGA cables for your exact model. I wouldn't use them. Not until you verify all the voltages for each pin is correct and it has any required capacitor.