Hickory: The NWN 2 Electron engine was born from the NWN Aurora engine, and they do share some asset formats, so in theory it may be possible with a lot of conversion, but they are two very different game engines, with the former not having many, many features available, or even required for NWN 2 modules. You have to ask yourself are you prepared to hope that the information is out there to allow you to proceed with a 'conversion', if it was feasible at all, or do you go the easier route and start from scratch? In a nutshell, no you cannot just "use/add to/play" your old module/s in NWN2.