The easiest way is to copy the music files from one Mac to the other using a USB stick or a drive. If you have to use the iPod, there is software available for the Mac which will allow you to access the files on it, and therefore treat it as a drive and copy them off. Then you'd load them into iTunes, and you can sync as normal. If these other tracks were purchased in iTunes, you should be able to download them to the other Mac without repurchase, so a copy wouldn't be needed.
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