I am not familiar with these terms. In 2008 three engines were available in the Outback. EJ253 is single overhead cam 2.5, EJ255 is double overhead cam turbo 2.5, and EZ30D is double overhead cam 3.0 six cylinder. According to Subaru no other engines were available.
The 2007 Subaru Outback has a flat 4 engine.
The 2009 Subaru Outback has a flat 4 engine.
The 2013 Subaru Outback has a flat 4 engine.
The 2002 Subaru Outback has a flat 4 engine.
The 2003 Subaru Outback has a flat 4 engine.
The 2005 Subaru Outback has a flat 4 engine.
The 2006 Subaru Outback has a flat 4 engine.
The 2014 Subaru Outback has a flat 4 engine.
The 2011 Subaru Outback has a flat 4 engine.
The 2001 Subaru Outback has a flat 4 engine.
The 2010 Subaru Outback has a flat 4 engine.
The 2008 Subaru Outback has a flat 4 engine.