Yachtworld search for SC31 southern cross (Sail) Boats For Sale
The first one in North Carolina looks good, has been upgraded and has a factory built interior. Engine must be quite new with only 300 hours (doesn't give engine year). For example electrical.
The one in Cambridge meanwhile has not been upgraded. Looks like factory built interior, engime is probably original with almost 2900 hrs. While it may have been
kept up, everything looks as old as the boat. For example electrical.
Don't necessarily discount a non factory interior. While you will find some bad ones, a good craftsman with time can exceed the factory quality as well.
I like the one in Carolina from the Yachtworld info.