The colour is slightly different, the OS-2 is more yellow than the very definitely orange DS-2. I did a quick comparison of pedal vs. image on-screen and the yellow colour is almost exactly right. For reference, the TU-2 tuner pedal beside it is white.
From a functionality perspective, the OS-2 combines the DS-2 features with their other overdrive pedal (not sure of the model number). I doubt the quality is quite as high as the DS-2 distortion, but to my ear it seems awfully close.
The OS-2 (distortion/overdrive combo) costs quite a lot more than the DS-2, so my guess is they've combined the same electronics to create this one.
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Guitars: Fender American Vintage 1957 Stratocaster, Fender American Highway One, Maton MS2000 Deluxe
Amps: Fender Hotrod Deluxe, Roland Cube 60, Fender Frontman 25R
Effects: Boss BD-2, OS-2, DD-20, TU-2