I got myself a couple of EF-RF adapter, after testing them with multimeter, I can safely confirm that only the Control Ring adapter is unique in the sense that there is a PCB that proxies the pins between the RF and EF contact points. All other adapters are basically passthrough, the pins are mapped directly from EF to the RF pins.
So for any non Control Ring adapter(including those third party drop in, Canon VND is a joke btw.), it is safe to use as long as the mounts are of high quality.