In current British English, different is followed more or less equally by 'from' or 'to'• • He was, in fact, totally different from Keith • James looked very different from the last time she had seen him • This is very different to the ideal situation • The next day was Christmas Eve, but it was no different to any other day except that the shop was very, very busy.

Note that the verb differ is never followed by 'to'.

In American English, but much less in British English, different is commonly followed by 'than', especially when a clause follows• AmE • It was all very different than they had imagined BrE • It was all very different from / to what they had imagined.

RECOMMENDATION: use different from or different to; avoid different than, which is common in American English.