I'm not doubting you with yours but I was thinking if somebody just randomly went out and bought all three there might not be.I don’t have an Orpington right now, but I can promise you my RIRs’ eggs are a much different color than my Wyandottes’ eggs.
When I had Orpingtons and Wyandottes their eggs were about the same and the RIRs were a tad darker.
My only pinkish eggs were from Sussex.