Two tabloid rags, counting The Times.

"The Times article was actually a different story, not the same one." Not really. The Times story and the Mirror story were really the same story at a different stage of development, and with a different angle. The Times ran it, the Mirror rewrote it gave it a different spin, and ran it again a few days later.

Essentially the story is that there is some anticipated problem about a visit to the White House which is likely not to happen; and there are at least two different accounts about what the facts are.

I'd call that two versions of the same story. Or variants as we say in relation to songs... A fairly nebulous story too at this point, which I imagine is why the other papers failed to pick it up. No doubt they will now.