You don't need to install either of them if you've just installed the game itself -- the main installer for any game should always be the most recent of the standalone files (though it may lag behind the Galaxy build by anywhere from minutes to days). Besides, the patches available for this particular game are old, now-useless ones from a couple years ago; the devs just haven't bothered/remembered to ask GOG to remove them. (Those two numbers in the patch names are, respectively, the version that that patch is compatible with, and what it will update it to. You can see the current version number of each installer -- including DLC -- and patch in the column after the name. As you're probably aware, for most games -- including this one -- higher version number = newer. :) )

Also, just for future reference: a good proportion of devs only pushed patches to GOG for offline patchers once upon a time, but found it too much of a headache and stopped after a while (as is the case for this game), or never bothered to do so at all. For any game that gets updated here but doesn't get a standalone patch installer, if you're not using Galaxy, your only option is to download the new main game installer -- as well as the installer for any DLC you have -- and re-install the whole kit and kaboodle. (You should not, however, have to uninstall the game before installing the new version.)