I guess I said that wrong, I meant that standard wise they have a different type, and coloration. Theyre supposed to be a lighter red then the RIR and a slate bar, though Im not sure about the hackle coloration. Im not really sure about where I was going saying they were developed at the same time as the RIR. I thought that the PC RIR was started when Metcalf sent eggs out to RIR breeders and they called them PC RIR, but Im guessing you know more then I do.
Back when the Red was being developed there were three comb types for the Reds two of which are in the Standard of Perfection. The Single and Rose Comb were excepted into the SoP but the Pea comb was not so most of the Pea comb Red were bred, shown and sold as the Buckeye breed. Over time the Red was bred into the "true" Buckeye breed because of this.
Chris