Genesis clothing is a whole different ball game when it comes to bringing it into Poser.  Clothing is made to fit a specific figure, and trying to make Genesis clothing work on Poser figures will involve reshaping and re-rigging to fit to Poser characters like La Femme and L'Homme. V4 and M4 clothing purchased from DAZ will usually be fine when used with V4 and M4 in Poser, but when you get into any of the Genesis figures, especially Genesis 3 and later, the weight mapping and joint parameters will have to be completely redone in Poser because the weight mapping in DAZ and Poser is very different. It's not a straightforward task, unfortunately.

I can't remember if Genesis 2 poses will work on Poser figures, my guess is the poses may need tweaking if the bone hierarchies are different..

Aside from DSON, DAZ Studio does allow you to export DAZ Studio content to Poser formats (characters, props, etc) but you will no doubt have a fair amount of work to get them working on Poser figures.