JDBC Driver JAR Files

In the default installation of PostgreSQL that comes with RedHat Linux,
there are two JDBC JAR files. These are

jdbc7.0-1.1.jar
and
jdbc7.0-1.2.jar

Does anyone know what the difference is (besides the obvious release level)?
Which is the 'better' one to use?

Thanks in advance.

Jerry Jalenak
Statistical Engineer II
Business Information Engineering
LabOne, Inc.
10101 Renner Blvd.
Lenexa, KS 66219
913.577.1496

Jerry(dot)Jalenak(at)labone(dot)com

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