Charger confusion


Hi! I own a AC adaptor for the HP-67 and one for the HP-21.
The one for the HP-67 has 3 pins on the plug and the one for the HP-21 has two pins and is switchable(85-127/172-354V).
But both adaptors are called "82010A". The information on the adaptors is the same, only the switch for the HP-67-adaptor is sealed.
Both seem to be unopened!
so why are they called the same?

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