Only two ports problem. Using iMac (Using Late 2013, 27“) as Display to connect to Macbook Pro (2019, 13”, 2 Thunderbolt 3 Ports)? - Ask Different
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New CPUs, faster Wi-Fi, same flaws: Apple's 2013 iMac reviewed | Ars Technica
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Alter iMac als Monitor - Anleitung für die Bildschirm-Synchro » Sir Apfelot
iMac (Ende 2012 und neuer): Äußere Vorrichtungen, Ports und Anschlüsse - Apple Support (DE)