the same as the Queen Mother was Queen Elizabeth in her day; but they've decided against it (at EIIR's behest as I recall).
therein lies a tale
Edward VIII was full of it when he abdicated and thought he could be King and not-king at the same time. ( Shades of that arch-shirker - Haaarrreee) - and he asked a QC what he became after King
Jowett QC said - "yers yers , you go back to what you were - a Prince of the realm and your wifey is a princessy - HRH to be exact"
THEN ( this is not too much for you is it? ) Jowet became Lord Chancellor, and opened a letter from Paree ( Edward for it was he), that said - "now you were saying....
And Jowett said: the King ( George VI) is the fount of all honours and it is clear.....
that is, as far as titles are concerned, the King says, cough and you say - how loud your majesty
and so.... Charles III can do or say or appoint whatever he likes
Oh and so yes Wills should be PoW, and does it automatically or on appt or however his Dad says
George III was NOT son of George II - grandson. The son was Prince Frederick of whom we never heard, got on badly with his Papa and WAS PoW. Frederick died 1759 and George just became PoW ( not according to the rules which is the eldest SON).
so it really is, whatever Charlie boy wants