Cheers, seems like the evga forums are wrong then.
According to THG, the NVIDIA 12-pin is compatible anyway (it was tested by another hardware site and they worked interchangeably, the pinout of the connectors is the same):
Nvidia's 12-Pin Power Connector Will Work with Next-Gen PCIe 5.0-Compliant PSUs
Your current GeForce RTX 30 Founders Edition will work with your next PSU.
www.tomshardware.com