Yes, the complete list will be made available. Sometimes, a near complete list is even online just before the submission deadline.
I still don't know how they picked those positions for me. I applied twice in total...first time it was such a bad fit, its amazing. Second time was slightly better, but I still changed it. You will have more competition for the final position, but that's still better.
Definitely change the position if you don't feel you are a good fit either. There is no point in applying for a position, for which you don't have a matching profile (even if you like it). There are so many people applying, sometimes with a near-perfect fit to the position...be that person if you can
