How Could The Monarchy Change Under King Charles III?

What changes might be made under a new king?

After 70 years the United Kingdom has a new monarch — King Charles III.

But the mailboxes, postage stamps, currency, royal attire and the late queen's image are still woven into the fabric of everyday life in the United Kingdom. So, what will change under a new monarch? The national anthem, for one. 

"God Save the King," was edited in immediately after Queen Elizabeth II passed. Other shifts will take longer.