Perhaps I exaggerate. The man's taller than me, thinner, and has better hair. So he's not an exact duplicate. But he's to share my office, train in my job functions, and answer to my name. I can only conclude that the cosmetic differences were added to lull me into a false sense of security.
They're taking over.
...but I'm okay with that.
Seriously, you'd think I'd be threatened. But it's a huge relief to be able to train my (eerily complete) replacement. When I leave this position, it will be in capable (if alien replicated) hands.