Spawn hector quadrotor in custom gazebo world.

I created a custom world using model editor in gazebo4, I was trying to run a fun project where I can fly the quadrotor model through the rings I created in the custom world, using vision based algorithm and solution. Thus, I came across hector quadrotor and wanted to use the robot model in this world. This command can spawn the quadrotor into an empty world roslaunch gazebo_ros empty_world.launch but this requires to have gazebo_ros. and that would remove gazebo4 and this world I created. Can I spawn the hector quadrotor directly into this world of gazebo4?