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There's no industry standard on CD changer connectors or the protocols that the head units use to talk to them. Even if you could get a plug to fit, the head would be talking to the changer in a protocol that it wouldn't understand.
But if you're lucky, you might find an interface box available. These are third-party devices that sort out the connector issues and translate the protocols. A quick Google search for "Renault Kenwood CD changer interface" turns up quite a lot of hits. Unfortunately, most of them seem to be for pages with lots of options on them (e.g. "Renault to Blaupunkt" and "Rover to Kenwood") so that they match the seach criteria but don't help you much. Still, it might be worth your time digging around them all.
If an interface is available, then it'll probably set you back 50 quid or more. Be sure to look into the possibility of just replacing the changer with one that's actually compatible with the OEM head. They might not be as expensive as you think.
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2010 Laguna III Initiale.