As you can see, copper tape circuits can get pretty complicated if you use Kapton tape as insulation between stacked layers of traces. Copper and Kapton (polyimide) tape are just two of the many ...

Turns out, the difference in the socket is just a few pins here and there, and you can make a 8th or 9th generation Coffee Lake CPU work on your Z170/270 board if you apply a few Kapton tape fixes ...