The best way to sync identical iTunes libraries on two different hard drives?

I have two external drives dedicated to media, one is a LaCie 2TB, the other is a 320Gb Toshiba, the LaCie has music and movies on it, this is the one I use for iTunes on my MacBook Pro at home. I have just created a new iTunes Library on the Toshiba which I want to be an identical copy of the music folder of the iTunes Library on the LaCie.
My question is; is there a Terminal command that can sync any new music added to the LaCie library as well as new Playlists - settings etc. with the Toshiba library? Or is it a question of just copying across new music files manually, then copying the appropriate iTunes library file? If the latter, which library file should be copied / transferred?

Please note: I can not simply copy the entire iTunes folder across from the LaCie because it is too big for the Toshiba, I will only be updating the music folder.

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