Do those accounts make the Noah flood story more or less plausible?
Well, I would say more plausible in that they account in similar ways. I guess it is for each person to accept for his/herself on whether they accept the Bible as a historical account.
Some Christians believe stories in the Bible should be taken literal and some believe many of the stories are metaphorical or fable, but with spiritual meaning.
As for me, I take the story of Noah's Ark literal. I could see a cataclysmic event submerging and separating Pangaea consistent with a Great Flood.
I can also see where accounts could vary in detail over time and through various languages, particularly with the injection of cultural names and pagan deities.