자매도시 VS 우호도시 다른점?

http://neosk.iptime.org:9999/List/tbvisitor/1111
http://neosk.duckdns.org:9999/List/tbvisitor/1111
http://blog.vivask.com:9999/List/tbvisitor/1111
http://neosk.mooo.com:9999/List/tbvisitor/1111