Firefly is Firefly. Your P10 shaders will work just fine in P11 if you render using Firefly as the render engine and not Superfly.

Genesis 1 and 2 do not need DAZ Studio installed installed to use DSON. There were quite a few threads dedicated to that. I tried and it worked fine.

There are free utilities to bring in G3 that do require DS to be installed. There is an entire discussion area here dedicated to that topic.

You can always export Genesis figures and such from DAZ as FBX and it should work in Poser though I have yet to try and as I don't use Studio in the first place.