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1) Yes.
2) That was arguably one of the best adjustments the movie script makes. When seeing Rocky's ship, Book Grace is only worried that if its an Aliens situation, the mission to save Earth will fail. Movie Grace is also concerned about his own well being, which matches the bits you mentioned better.
In the books Grace knows that he must be a super brave and selfless person to sign up for a suicide mission, he hasn't remembered anything about how he got there at this point.