Raspberry pi2 Kano upgraded to a pi3

I had a pi2 with Kano on it. I wanted to get a pi3 to use the additional apps and also save to Kano world - wasn’t possible to create an account from my pi2 version.
My son has completed story mode so I don’t want to just flash a new version of the OS - I don’t think there is a way to upgrade the OS but does anyone know where config files etc. are located within the OS for story mode, tux paint etc?

Any help is much appreciated!