Naim Stageline versions

I am considering a Stageline N and saw the following WTB ad.

Looking for a Stageline both S and N versions, new or used, mint condition, etc. Must be after the 2003 upgrade so 200,XXX or above.

What is different after the 2003 upgrade?
Don't know the specifics but according to NAIM there was a change in 2003:

I notice that some versions of the Stageline on audiogon have a single DIN socket while others have two (they both have the RCAs).