All 10xxx parts are either Ice Lake (10nm) or Comet Lake (14nm), none are Skylake. I mean, if you want to get technical both are "Skylake derivatives", I guess.
The uarch and core differences between Skylake, Kaby Lake, Coffee Lake and Comet Lake are neglible. The most significant changes were claims of hardware fixes for some Spectre and Meltdown variants in Coffee Lake, which is still a really minor change. The minor IPC differences arise from different cache sizes and interconnect.
