Short answer... no compatibility issues and yes they will work.

The products that you mention.. plus many, many more from DAZ3D will all work just fine in Poser 8.

Bear in mind that the majority of DAZ's products were made and available even before DAZ Studio became available.

You will find that the majority (if not all) of newish DAZ products... including those that you specifally mentioned... have a DAZ Studio and Poser version of the product files.

I have bought hundreds of products from DAZ3D and use them all in Poser... I don't use DAZ Studio.

"You don't have to be mad to use Poser... but it helps"