With the newer version of the NPC patch, you no longer need the Reunion patch. If you have the Reunion patch already installed, the NPC patch will overwrite the files and it will work fine. The latest version of the NPC patch recommends you use an unaltered char.lgp file from your CD. If you don't have a clue what I mean, it may be easier to backup your save file, reinstall the game, then apply the NPC patch. You can also use the high res cloud patch as it patches in a different .lgp alltogether. Short answer, yes they all work fine together.
