I was trying to explain this to someone verbally, but ended promising to do a diagram. No, an IEC 60320-1 C-14 connector is not the same as a 60320-2-2 E connector. Maybe someone else can explain it more clearly, but this is my take on it:

(SVG version ›here‹)

(Update, 2020-05-28: It seems that IEC 60320-2-2 has been withdrawn and the elements thereof transferred to section 1 and a new section 3. So the codes above are outdated.)

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