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In page Diatessaron:

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Most scholars agree that Tatian did, from the beginning, include the longer ending of Mark (Mark 16: 9–20), and correspondingly is amongst the earliest witnesses to this inclusion.[citation needed] Tatian added no significant wording to the textual material he took from the separate gospels.[4] Only 56 verses in the canonical Gospels do not have a counterpart in the Diatessaron, mostly the genealogies and the pericope adulterae. The final work is about 72 per cent the length of the four gospels put together; around a quarter of the text of the separate gospels being adjudged by Tatian to be duplicated. (McFall, 1994).