After looking into this more, it seems that if your phone supports super fast charging 2.0 then you need the 5A cable with a 45W charger.
But it seems that Samsung supplies the 3A cable (when purchasing the phone) and that is only 25W super fast charging 1.0 capable. IIRC the S23 base model can only charge at super fast charging 1.0 25W speeds. S23+ and Ultra can do super fast charging 2.0 at 45W.
If you're charging at 45W your phone will actually briefly display 'Super fast charging 2.0' on the screen when the charging begins.
5A cable is double the price of the 3A one, so the high prices on these 45W chargers seems justified. It's possible that the S23 Ultra owners received a 5A cable with their phones.
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