2015 Red Extreme Okeetee (outer-most in pic) compared to a 2016 Classic Extreme Okeetee.
The Classic in this pic may look closer to Buckskin, but its yellowish ground color will be more pumpkin orange at maturity.
He just looks more yellow because of being next to the red-on-red 2015. The redder of the two is believed not to possess any red-modifying gene mutations, but breeding trials may reveal otherwise. I purchased the parents of the redder one from a guy who swore they possessed no gene mutations what-so-ever?