Connecting two scaled cars with similar package and topics

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Hi Everyone,

I have a problem on which I would like to ask for a solution that would take the least time to work out. So, recently for my research I built a second 1/10th scale car. In order to keep both old and new car identical, I want to use similar package that I had on old car. But, during communication using one ROS Master, I only get one set of topics for both cars instead of two set of topics, one for each car. It appears that the ROS masters topic are available but the slave car's topics don't make it. (1 car is ROS Master and the other is slave)

I did some research myself and found I could remap some of the topics for the slave car, but my package is really big and I don't want to spend a lot of time changing all of the topics to different names. Is there any other way I could have both cars on same network communicating and not have to change all of my package names ?

Also do I need to remap all my parameters as well or they get remapped automatically once I fix my remaps for topics ?

Thanks a lot for your help.