An APK is an APK is an APK?

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http://androidforums.com – Is the APK file for all or most apps that I have on my Galaxy Nexus, the same APK that's on my "NookDroid" which is running CM 7? Will the APK on my GN for something like DropBox, GDrive and such, work on another ICS based device/tablet? I want to grab the APKs to install on another device that's heavily locked down. :mad: I was thinking that I could grab APKs from the CM 7.2 NookDroid's TitaniumBackup files. But I'm not sure where in the file system they live on my GN. I have ES File Explorer on the NookDroid and it seems easy to grab the APKs from the backup files which TB store (General)