" would be more natural for me personally. "looked different" is much more common of course, but there is a slight difference in nuance. "looked different" can be used for superficial things, like dress or hairstyle, while "looked changed" seems more profound.
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Mr. TomEverything in the house looked different to him as he stepped in after ten years.Everything in the house looked changed to him as he stepped in after ten years."looked different" is the straightforward way of saying it. "looked changed" is noticeably less usual and for me has a slightly different nuance.