Yes the GT120 is rebadged 9500GT...
For you next question, I would get the 9500GT DDR3 over the GT120 1GB DDR2...
Reason : The DDR3 have higher performance than the DDR2 and the 9500GT/GT120 anyways cannot take advantage of the 1GB of RAM...
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By the way at what price are you getting those cards for???
Because I think for the same price, you can get the ATI 4670 and it will easily outperform the 9500GT...