Well, for one thing, Charles was a toddler, not quite three and a half, when his mother became sovereign, whereas William is already a middle-aged man with his own family. The last time there were similar circumstances was in 1901, when the Yorks (George, Mary and their children) became the Wales family. Not sure there were compelling protocol reasons for George's delay of several months as compared to William's almost immediate possession of the PoW title.
How can anyone know? Past practice, if considered at all nowadays, is at best perceived as a guideline, not a hard rule.
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