Memory and imagination are separate and distinct. Their sources are entirely different. Memory resides in the mind, as a repertoire of experience. When the mind ventures outside itself, making foray into the realm of imagination, a domain more mystical than dream is explored.
Should memory and imagination commingle, memory is deliberately distorted, and an exotification, or romanticisation, or hyperbolisation, a wilful exaggeration of the known truth occurs. If deceit is not one’s intent, then the ingenuous desire simply to embellish or to enhance the original story towards the farthest verges of phantasy often motivates.