70It is for the referring court, which alone has jurisdiction to assess the facts, to make the necessary determinations in order, first, to identify the relevant categories of workers and, secondly, to determine whether the requirement of the comparability of the situations in question is satisfied (see, to that effect, judgment of 5 June 2018, Montero Mateos, C‑677/16, EU:C:2018:393, paragraph 52).
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