Sam Neil was awesome as Reilly, Ace of Spies, which was set in pre WWI. A fantastic series, I encourage all of you to take a look at this series, or at least Google it, and inform yourselves on this excellent series.
probably nothing major except for the occasional butterfly. A different actor as James bondmight lead to OTHER actors becoming james bond earlier.... Vin Diesal as bond in 1996?
As a chip on the shoulder Ulsterman-Kiwi, Neill had a malevolent streak that would have made him quite a vicious Bond.
Witness his evily inspiring antinomian 10 minute monologue as Anti Christ Damien Thorn in "Damien Omen III: The Final Conflict" 1981! http://www.imdb.com/title/tt0082377/