With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: In the ATA standard, pin 20 is defined as a mechanical key and is not used. This pin's socket on the female connector nonetheless left open to pin 20 from the male cable or drive connector; it is thus possible continue to use the plug ambidextrously.
text_B: When these connectors are manufactured, is it likely that a kind of textured surface is added to one side (as is common on USB plugs) to alert the user to which way around they must be held when inserting?
NO.