The RF603C II is great because I can carry one in my pocket and it will trigger the corresponding one on the camera.
Also the RF603C II (as transmitter) will trigger other flashes (with RF603C II as receiver) I have that take a sync wire.
But I also use YN600EX-RT II which has its own wireless technology to run with other YN600EX-RT II.
Is there a way to have either the master YN600EX-RT II or RF603C II on the camera trigger BOTH the dumb RF603C II receivers and the YN600EX-RT II slaves? And can I do that still with remote RC trigger somehow?