Olympus E-P3 using same sensor as before?

According to DxO - http://www.dxomark.com/index.php/News/DxOMark-news/Olympus-PEN-EP3-Image-Quality-Review the E-P3 sensor is "pretty much the same sensor as the Olympus PEN EPL2 and Olympus E5"

While I have many doubts about DxO and the implications they draw, I'm assuming they do this right.

If as stated in many reviews the E-P3 has a better higher ISO performance, then its probable that this is achieved in software.