They will, but not together. You'll need the clubsport usb adapter for standalone usage.
By the looks of it, yes. But the G27's arent too shabby.
If its the non-load cell version, no. Both are potentiometer based, so basically its a side-grade. Looks and materials may differ, but they function the same way. If its the load cell version you're talking about, then its a clear upgrade.