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If you want to replace the new node with existing node then you may lose the previous data on the same node. So better to create a new node under the same Tier .
If you don't care about your data, Then do the below steps to replace the existing with new node.
1) Open your server and navigate to the Appdynamics Agent folder-> version->Conf
2)Open the controller-info.xml file and edit the below parameter with new details and restart the application to apply the changes.