Canada isn't bound to the monarchy or to the UK. The king is just a figurehead, and the king's representative (the Governor General) is a powerless rubber stamp.
Now, to be clear, the (conceptual) figurehead is taken seriously. When the queen died, a great renaming happened, changing each province's court of queen's bench to the court of king's bench, Queen's Counsel are now called King's Counsel, and of course new currency is being minted with images of the king. But, none of that means the actual King Charles the person has any power at all.
Now, to be clear, the (conceptual) figurehead is taken seriously. When the queen died, a great renaming happened, changing each province's court of queen's bench to the court of king's bench, Queen's Counsel are now called King's Counsel, and of course new currency is being minted with images of the king. But, none of that means the actual King Charles the person has any power at all.