One is the 2.1GHz model, one is the 2.4GHz.
Posted from Ubuntu.

Squier Precision Bass Special in Antique Burst (LH)
Rotosound Swing 66s, 45-105

On slapping on a bass:
Quote by supersac
pretend its a woman
i have no helpful advice

Yeah, ram and processor. Personally I would go with the cheaper one. Seeing as it's a Mac it probably won't be used for things like games that will greatly benefit from that little boost.