No, they don't share the same Recent Changes. It is separated now.
From: faigos(a)gmail.com
Date: Mon, 8 Aug 2011 02:48:43 -0300
To: foundation-l(a)lists.wikimedia.org
Subject: Re: [Foundation-l] The problem with Incubator: An interactive journey
8. All the "test wikis" share one single Recent Changes page.
--
Fajro
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