What is the difference between word personalised and personalized besides spelling?

There is no difference in meaning between "personalised" and "personalized" besides the spelling. They are both correct spellings of the same word, with "personalized" being the more common spelling in American English and "personalised" being more common in British English.

So, whether you use "personalised" or "personalized" depends on the style guide you are following or the audience you are writing for.