Diaries and memoirs as a historical source -- the diary and memoir of a Rabbi at the "Konin House of Bondage"

Compares two documents, both are manuscripts, one a diary and the other a memoir, written by the same person - Rabbi Yesoshua Moshe Aharonson, who was expelled from Sanniki with the rest of his community. Asks, can one undertake, in a broad context, to compare the characteristics of the themes and approaches of the diaries with those of the memoir literature in its various stages?