You have a lot of good input from great engineers here. One thing you also need to realize is that from code to code, there can be something that has been deprecated and or added. What you need to do is make sure you have a good backup of your old config and when you get your new device up and running, perform another backup and run a diff between the two to see what has changed. If you skip running a diff and the code versions were different, then you might have issues with a setting that can cause poor user experience.
-Scott
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