Different than is common enough in the US. According to those who count these things up, it's nowhere near as common as different from and you can send some people into fits of apoplexy by using it at all. I was involved in a knock-down drag-out argument about it on the TVR forum once and came out deciding that none of the phrases (you'll also hear different against and different with if you try really hard) make any sense and one might as well say different nor or recast the sentence to say that two things differ in some respect.