Are the ET and Poltergeist houses the same?

No, the ET and Poltergeist houses are not the same. The house featured in "E.T. the Extra-Terrestrial" is located in a suburban neighborhood in California, while the house from "Poltergeist" is a fictional location portrayed in the film, also set in California but with a different architectural style. Both films were directed by different filmmakers and have distinct themes and narratives.