A pair of TARDISes and two Doctors, side-by-side and face-to-face. It’s like looking in a mirror, or it would be if both Doctors looked alike, but they don’t. This is him now, his current face and body, while the other Doctor is a version of him that used to be. Which one is it, the sixth? No, the seventh; that hat’s a dead giveaway. Fezzes are way cooler.
So not exact duplicates, not identical, more like fraternal twins.
He looks at the other Doctor, who looks back at him.
They speak in unison. “We have to stop meeting like this.”