That's two different questions, Everett.
The chords will be the same. For instance, a C chord on both instruments will contain the notes C, E, and G.
Whether or not the piano player in question will be able to look at a list of chords and play the song is something I can't tell you. If it's sheet music, with notes on a staff and the the guitar chords written above it, a piano player who can read music should be able to do it.