This intel 4 and 7 is so confusing trying to figure out what the nanometer equivalent is.
There is no actual nanometer equivalent, and hasn't been since Intel launched 22nm because of FinFET. I believe most of the rest of the market jumped on that bandwagon at their "16nm" nodes. Sadly everyone but Intel has been shady with their naming conventions which is why you see the 14nm+++++++++++++ jokes. Samsung's 8nm that nvidia used for Ampere is just a refinement of their prior 10nm process as an example.
Intel's 10nm is relatively straightforward: the one they don't talk about CNL, then 10nm ICL, 10nm SuperFin TGL, and what would have been 10nm Enhanced SuperFin which was turned into Intel 7.
What would have been Intel 7nm is now Intel 4, and Intel 3 is a refinement of that. What would have been Intel 5nm is now Intel 20A with Intel 18A being the refinement. This is probably inspired by the way TSMC has done N7/N6 and N5/N4. Realistically these names are all bs and are intended to tell customers "smaller number better".