Upgrading from arduino to spark 3

I set up a diy solution a few years ago, but have now decided to upgrade the system with a spark 3 (ordered today and eagerly awaiting multi chamber control😀)

With regards to my raspberry pi3… any advices to upgrade?? Should I start fram a clean memory card or is it possible to upgrade the sw it is currently running (I don’t have the sw release, but it is at least 2 years old)