A good comparison and conjecture but I'm more inclined to think they are individual pieces of similar design. I am made to understand that Cartier does not divulge information regarding its pieces made for private clients, so we could not even ask them a question.

I also think that Cartier may still have certain jewels believed lost intact in their vaults though. I guess we may see one or 2 pieces reappear at say the next British Coronation where they may be borrowed or even bought just for that occasion, 'there is not much other occasions where such grand and historic jewels might be worn, and I'm sure that's why aristocratic families eventually sell up.

But I'm not sure with all the woke and cancel culture taking shape and is mainstream now along with a virtue signaling Prince Charles on side if they may even be a next coronation.

Regards,

Dave.