The two categories overlap each-other, but if we look at the scientific literature we can find some difference: a classification map is always something that is realized as a map, but a taxonomy map can remain conceptual. Taxonomy mapping is the process of categorizing (e.g., asking the above question :) ). Classification mapping is the process of making a classification map.
"Classification" and "taxonomy" are two closely related words that some people find confusing. Both terms reflect the fact that we encounter large amounts of information in everyday life and our brains need some way to synthesize and contextualize that information. Concepts like classification and taxonomy help us make sense of the world by improving our ability to find important content in an information-rich world.