33Next, as regards more particularly old-age benefits such as those at issue in the main proceedings and in view of the case-law of the Court to which the EU legislature refers in recital 9 of Regulation No 883/2004, the concept of ‘equivalent benefits’ within the meaning of Article 5(a) of that regulation must be interpreted as referring, in essence, to two old-age benefits that are comparable (see, to that effect, judgment in Klöppel, C‑507/06, EU:C:2008:110, paragraph 19).
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