If certain historical figures had died at different time, it would have changed history.
One assumes you are excluding different outcomes to attempted or successful assassinations, and deaths by sudden accident.
Also, of course, deaths in early life of people who became historical figures.
The subject therefore comes down to natural deaths of historical figures earlier or later than their OTL natural deaths, but still near the same date.
Let us say up to one year earlier or later.
Warren G. Harding: a year earlier, and IIRC the Teapot Dome scandal cannot be buried with him; it will plague Coolidge in the 1924 election. A year later, and he may be such a handicap to the GOP that he is pushed off the ticket in 1924.
King George V: a year later, and Edward VII may never be King.
Neville Chamberlain: a year earlier, and someone other than Churchill probably succeeds as Prime Minister. Or Churchill succeeds, and may be forced out of office after the Norway debacle.
Ioannis Metaxas: A year earlier, and he is not there to rally Greece against Italy's invasion.
Franklin Roosevelt: A year earlier, and the Democrats have to find a new Presidential candidate in 1944. A year later, and he attends the Potsdam Conference instead of Truman.
Mohammad Reza Pahlavi (the Shah of Iran): A year earlier and the Iran hostage crisis may never happen.
Pope John Paul I: A year earlier, and he's never Pope at all.