Skylake to Coffee Lake is a strong long-tail search because users often remember the socket more clearly than the generational details. The problem is that Socket 1151 is not a one-generation story, so CPU searches around it usually need extra context before they become useful.
That is why this article sits next to the Socket 1151 collection. The facet page answers the platform query, while this article answers the generational query that often follows immediately after.
Why Users Search The Generations, Not Only The Socket
A platform search tells you where the CPUs belong. A generation search tells you what changed inside that platform. That is the difference between comparing Core i7-6700K, Core i7-7700K, and Core i9-9900K as random Intel chips versus understanding them as steps in one broader desktop story.
Best Next Step
If your question is still platform-wide, use the Socket 1151 page. If you already know which two generations matter, compare Core i7-6700K vs Core i9-9900K.