My way of dealing with "Miri": The Revisionist Deconstruction of Apocrypha, or to put it another way, no, the planet in question wasn't really
identical to Earth, down to the continental configuration. Rather, it was a Class-M world with conditions within fractions of a percent to Earth.
I know, I know, once you start down this road, foreve will it dominate...sorry, wrong universe. I recognize the slippery-slope here. But, do you want to be faithful or do you want it all to make sense?