For the Blu-Ray release in 2011, the international version of the movie was extended by 4 scenes, summing up to 21,5 sec. Additionally, there is still a much longer Director's Cut available in Italy (see here).
The longer version starts with a explanatory text.
Snaky waits longer for Harmonica to exit the train before telling his colleagues to approach it.
Harmonica lies on the ground longer, then he takes his coat in order to make an armlet out of it (which can be seen in both versions).
The shot of Harmonica getting up with the suitcase is longer. He can also be seen taking a first step before the vut to the McBain farm.
Maureen McBain looks around longer when the crickets suddenly become quiet.