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I'm studying German morphology; is there any difference between Zusammenrückung and Durchkopplung?
They both count as determinative compound, while Zusammenrückung can be connected with or without dash character, but Durchkopplung must be connected with dash character to combine the words, as far as I know.
There are different definitions of Zusammenrückung, but they have in common that they're morphological concepts. When used for a special type of compound, the term usually denotes those that combine an interrelated group of words (syntagma) into one single word and thus often feature inflected parts, as in Tunichtgut, Möchtegern or (das) Dankeschön, but also non-nouns like solcherart, allerhand. You're right that in some cases they can feature hyphens to improve legibility, like das Aufs-Klo-Müssen in place of das Aufsklomüssen.
Durchkopplung, however, is mainly an orthographical thing if interrelated nouns (however they might be connected, be it by Zusammenrückung or by Ableitung) cannot be merged into one compound. For instance, it's Werner-von-Siemens-Straße since * Wernervonsiemensstraße isn't possible.
