The preposition that most commonly follows 'different', on both sides of the Atlantic, is 'from' - 'She's very different from her sister'. In North America, however, some people also say 'different than', and in Britain, some people also say 'different to'. A year or so ago I discovered that I seem to be one of the latter, on some occasions, at least.
About nine months ago I wrote a post on different to (link below), on how much it is used, and on how acceptable it is, in British English. In this post, I want to take a more historical view, with the aid of Google Books clippings facility, which I've only recently discovered. Click on any of the clippings to see the original at Google Books.