Hwinfo 64 will display which cores are which.
Intel
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Use park control. It will show you which ones are e cores and let you steer toward pcores, ecores, or a combination depending on thread duration.
First 16 threads are P.
Last 4 are E
That should be right I guess.
Other answers here are correct. You could also install Process Lasso - it will label the E-cores "E"