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In Kinetic, which package is used depends on the order in which they appear in your environment variable ROS_PACKAGE_PATH=. Which ever package is found first will be used. You can check the variable with printenv | grep ROS. If your built workspace does not appear in the ROS_PACKAGE_PATH try sourcing your workspace again and launching it. Sourcing by default with kinetic would be something like source ~/catkin_ws/devel/setup.bash.