The library can just be copied. If the masters are managed it's as easy as dragging the library from one systems HD to the others. if the masters are referenced then you will need to move those also.
The easiest way to do this is to use target disk mode. Search the Apple Support site for directions if you are unfamiliar with the setup.
The app is a different matter you really need to install it from your original media on the new system. Trying to copy an app manually will cause problems as they may have installed things in places other then the App folder.