How to copy config to another pi?

I got a nice working system with pi1b. I want to make a copy for a friend.

So I copied the files to another sd card and tried that in another pi1b. But then the kodi on the second sd card got all the default settings and none of the adons are installed.

I checked the files on both sd cards with winmerge and they are exactly the same!
Where is the kodi config saved? How to copy to another pi? Huh