When Prince Harry and Meghan Markle stepped down from their roles as senior royals, they gave up using their “HRH” titles.
It is believed he could be referred to as simply as the “Duke of Sussex” for the service but it is up to the Queen to make the final decision.
According to reports, Harry, who was stripped of his military titles, will not be expected to wear his military uniform during the funeral.
On the other hand, Prince William could wear his military uniform at the service for his grandfather.
Royal expert Richard Fitzwilliams said anything which would “distinguish” the brothers is likely to be avoided.
He said: “This is obviously very sensitive. Anything that distinguished the brothers in that way, which would be so obvious for anyone watching, would probably be avoided.
“The whole thing we do not want is any form of rift. I’d suggest it would be handled in such a way as it goes totally smoothly without a hitch, and there are no issues.”