There is exactly zero evidence anything occurred in either case. The differences you mention are not substantial and may represent no more than having learned from how the last hoax blew up, not to repeat the same mistake.
Not quite. Fairfax himself has admitted he had sexual relations with Dr Tyson (probably because the hotel was bound to have video footage of them entering the room, like all hotels do.). The only point of contention is, he says it was consensual.
That is the exact opposite of the case of Blasey Ford who has never met Justice Kavanaugh in her life and got paid to make things up to stop Kavanaugh’s nomination.