If you look at their pics side by side, you can tell they are definitely different people. However, the costume and makeup teams made an effort to make them look very similar. They were both playing the same character, and the switch could have been very distracting if they hadn't.
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The original actor playing Dumbledore died, and had to be replaced by Michael Gambon.
No the actor that played Dumbledore in the first 2 movies died.
No, he was in Harry Potter. Ian McKellen as gandalf in Lord of the rings.
Michael Gambon played Dumbledore in Harry Potter. Ian McKellen played Gandalf in The Lord of the Rings and will do so again for The Hobbit.
Albus Dumbledore was portrayed by the late Richard Harris in the second Harry Potter film, Chamber of Secrets. In all subsequent films, he has been replaced by Michael Gambon.
Michael Gambon is playing Prof. Dumbledore in the new Harry Potter film, Harry Potter and the Half-blood Prince.