Is it possible to saved 2 server with the same port if one of them isn't being used

Just started to use AMP and setting up some server for my friends for the summer. the plan right now is we want to test a few modpack before picking one so I’m creating a server instance for each one just so we can swap server pack really fast. my issue is that I can’t seem to make 2 instance with the same port it has to be a different one for each instance. I understand why this exist for when running all the server at the same time but I’m not so is there a way to have them all still be the same port or maybe have it auto swap to the right port when it not in use?