Its possible. Replacing the tach is relatively easy. The 0-60 times should be quite close. Not the exact same, but quite close. The ZHP commands more money, and thats why he may try to say it is. A cluster from a wrecked ZHP is easy to swap in and nobody would know.
Now, this is a Canadian car. In that case, Carfax is useless. If you want the Canadian history of the car go to Carproof.ca.