From an artistic point of view the distinction between Evangeliaria strictly so called and Gospel manuscripts is of little importance and is generally disregarded. It consists merely in the fact that the illuminations of the Evangeliaria occur as a rule at those passages set apart for the greater festivals of the year.
From an artistic standpoint, the difference between Evangeliaria and Gospel manuscripts is not significant; it's mainly about where the illustrations appear.  They are usually placed on the pages containing passages that are highlighted for important religious celebrations.