size of JAR generated by mvn

I checked out latest head and noticed it's no longer possible to compile closure using `ant`. I created a `settings.xml` as `README.md` advises and called `mvn -DskipTests -pl externs/pom.xml,pom-main.xml,pom-main-shaded.xml`. I ended up with plenty files in target folder. `closure-compiler-1.0-SNAPSHOT.jar` is about 9 MB size, `closure-compiler-1.0-SNAPSHOT-shaded.jar` also. When I download the compiler package from the github wiki the `compiler.jar` is about 6 MB.
In my folder there's `closure-compiler-unshaded-1.0-SNAPSHOT.jar` that's 6 MB and also `original-closure-compiler-1.0-SNAPSHOT.jar`
What is the JAR included in your binary release? What is the difference?