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If the older 20A CFGI doesn't have T-slot, it can be used on 15A or 20A

Kellems Shop the Hubbell HBL5461 AC Receptacle at Ubuy India NEMA 6-1520 T-slot female receptacle, perfect for industrial grade use Get yours today! Most receptacles are 20a pass through From what I have read only the plastic face is different Yes but they are rare at least in the US

firebird double 27 slot The 5-20R T-Slot receptacle allows you to plug in either a 5-20P or a 5-15P plug, allowing greater flexibility In modern home installations, 5-20R T-Slot However, the 20A 5-20R receptacle will accept both a 5-15 plug and a 5-20 plug Those are the ones with the T slot This is why there are 15