I see no harm in uninstalling the older "false" copies and leaving the single non flase for each edition. You have 2008, 2010, 2012, and 2013 which you need to keep one instance of each of these which are the active ones otherwise software with dependencies will break if say you removed all 2008, 2010, and 2012 and kept 2013 and the software needed 2008, 2010, or 2012 edition of the redist package.