It's actually the same thing, at least from a cognitive and memory perspective. See e.g.It's one thing to be able to memorize it but a whole other thing to be able to quote certain quotes on occasion, as Jesus did.
Rubin, David C. (1995). Memory in Oral Traditions: The Cognitive Psychology of Epic, Ballads, and Counting-out Rhymes. Oxford: Oxford University Press.
Talmon, Shemaryahu. (1991). "Oral Tradition and Written Transmission, or the Heard and the Seen Word in Judaism of the Second Temple Period." in Wansborough, H. (Ed.) Jesus and the Oral Gospel Tradition. London: Sheffield Academic Press.