Paul Seawright Sectarian Murders
These were not in date order so this does not seem to be something that he felt would add to the narrative.  The narrative here is to highlight the fact that two-thirds of the victims of the troubles were civilians. He depoliticized the images by leaving out the specific political information in the text that accompanies each picture.

In an interview, he talks about the series having three parts, the image, the text and then an invisible element where the viewer fills in the gap between the image and the text.

Joel Sternfeld On this Site
At first, I thought these were in date order both on his website and in his book and most of them are.  I don’t believe that for this work, date order adds anything to the narrative. I see the narrative as being the images and what they represent collectively even though there is nothing in the images themselves to suggest the impact of the events that took place there. Information relating to the event and its importance is held in the text.

Chloe Dewe Matthesws Shot at Dawn
It is clear that she had sequenced her images by date. I couldn’t find any reference to why she decided to do this but for me putting them in date order has added to the narrative. It gives the reader a feel for the fact that this practice continued from the beginning to the end of the war. This would not have come across if the images had been in random order.