What is Identity? If an axe had had several new handles, and one or two new heads, but there was always continuity, is it still the same axe?
Consider the painting, the Mona Lisa. Is a photograph of it the same as the thing itself? How about an exact and indistinguishable copy in the pigments of the time, brushstroke for brushstroke? Since the thing itself is not at Absolute Zero in a bose-einstein condensate, the arrangement of the individual atoms and molecules of the Mona Lisa now and the Mona Lisa now would differ over the time interval between your reading of the two now's. Does that make them different entities?