Well, apk & sys are the same,but the accompanying files are not.
Data.zip, branding zip, ux files...specially skins (zip files in content/skin folder)...play a big role in the layout and navigation options.

From your pics, package on Nexus is adjusted by users from "carsforum".
If you take complete content from it and put it in Galaxy, all you have to do is adjust the resolution on it (in sys). Since Nexus is 1280x800 and Tab is 1024x600.