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Yes, you can change the topic name.
Add remap in your launch file. I recommend this way. <remap from="original_topic" to="changed_topic_name"/>
Change topic name and update fimware in OpenCR scripts using arduino. Open the OpenCR example -> Turtlebot3 -> Turtlebot3 burger & waffle -> turtlebot3_core. and change topic name in turtlebot3_core_config.h please see : http://emanual.robotis.com/docs/en/platform/turtlebot3/opencr1_0_software_setup/#usb-port-settings