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ROS packages can subscribe and publish regardless of the other nodes. (can be ROS/ROS2/Noetic/Melodic) I think your struggle will be with running the ROS Noetic package in a ROS Melodic environment, you have to make sure all the dependencies can be found.

If it's an option for your case I'd settle for one ROS version, or have 2 ROS systems that interact (1 running ROS Noetic, 1 running ROS Melodic)