Merge two libraries

Is there a way to merge two libraries ?
On my MBPro I have one iTunes library. On my MacPro another.
There's some cross over of music, but a lot of difference too between them.
Can I merge the two library files (on my external terabyte drive) and import the one large library file to iTunes on both mac's ?

Drag one of the two libraries to the external drive, launch iTunes on that computer with the Option key held down, and point it to that instance of the library. On the other computer, point iTunes to the library on the external drive and then drag the internal library into the open iTunes window.
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