Yes. It is always best to run the same version of the client as the server. Incompatibilities between versions can cause problems. The EJOB.jar file can be found in the following directories:
drive\Program Files\Easysoft\Easysoft JDBC-ODBC Bridge\jars (Windows. Default installation location.)
-Or-
installation_dir/easysoft/job/jars (Unix. Default installation_dir is /usr/local.)
Remember to remove the EJOB.jar file from all locations on your client machine as different applications load the driver from different places.