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Remap will do what you're wanting: http://wiki.ros.org/roslaunch/XML/remap

ex.

<node pkg="nodelet" type="nodelet" args="load image_proc/crop_decimate realsense2_camera_manager"
      name="$(arg camera)_depth_image_decimator" respawn="true"  output="screen">
  <remap from="points"     to="/$(arg camera)/depth/points" /> 
</node>

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