I can't imagine the newer cameras, especially the 6 megapixel ones like the D70, would give you worse results in low light than an older two megapixel camera, and I would expect the results would indeed be much better.
I don't know, technically speaking, which features on the D70 would be responsible for addressing this issue (whether it's the increased number of megapixels, the larger pixels, the greater ISO range or all of them combined).
I do know there are forums that specifically address the capabilities of the D70 camera and others where you might be able to ask this question. Try
www.dpreview.com for starters.