The first 2 roosters you have pictured are actually Chocolate Silver Laced. There is a light chocolate (2nd pic) and a dark chocolate (1st pic). If either of these are crossed with a "mottled" then you get a penciled/partridge pattern, just like the original post.
I don't know how it's different but I DO know that it IS different! I can only rely on what I see and my flock is better than I've ever had. Their feathers are beautiful, they produce more eggs, stronger shells & bigger eggs. They will not eat anything else.
If you actually tried the Keefarosa feed then you'd see the difference! 1 bag of feed has absolutely everything they need...grains, protein, oyster shell...everything! Once you're chickens try it you won't get them to eat anything else.