You should always reuse config.env as it includes your configuration. As you’ve spotted in most cases the only thing that changes between versions in the other compose files is the image version number, but that isn’t always the case. For example going between 2.2 and 2.3 the version for XMR changes too, and going from 2.1 to 2.2 I think adds the quickchart container, so it’s best practise to always get a fresh copy and make your mods to it.
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