I don't know much about how the UI widgets are implemented on Android - Is it such that Nokia/Intel could reimplement these and have Android apps look consiste

I don't know much about how the UI widgets are implemented on Android - Is it such that Nokia/Intel could reimplement these and have Android apps look consistent with MeeGo UI, or will developer have to do some UI tweaking in order to look reasonable on the different OSes? EDIT: I suppose this same question also applies to the similar Dalvik implementation on the BlackBerry Playbook that's been rumored.