The Rogue Cut primarily alters the "future" timeline (2023) by explaining how the X-Men maintained Wolverine's consciousness in the past after Kitty Pryde was injured.
: Once rescued, Rogue uses her powers to absorb Kitty Pryde's abilities, taking over the task of keeping Wolverine's mind in 1973 for the duration of the mission. X-Men.Days.of.Future.Past.2014.THE.ROGUE.CUT.21...
If you are looking to watch or purchase this version, here are the technical details: The Rogue Cut primarily alters the "future" timeline