The Cambridge Dictionary says this:
The adjective different means ‘not the same’. When we compare two or more items, it is usually followed by from. We also use different to, especially in speaking:
Adam is so different from/to his brother.
This house is very different from/to your last one.
I wonder why it would say 'especially in speaking' after the usual 'from'? That does rather suggest, at best, an 'informal' usage; and at worst, an incorrect one.
Others may disagree, but I understand this as part of the descriptive (and not prescriptive) nature of dictionaries, whereby if enough people get something wrong over time, it makes it in - not as proof of its correctness but simply as a record that this is what is commonly said.
I imagine that, in time, 'could of' and 'should of' etc. will be found in dictionaries as valid alternatives, purely by dint of the fact that enough people have consistently got them wrong. I believe 'literally' is already listed in dictionaries as effectively meaning either 'literally' or 'NOT literally'.
Maybe, in time, the word 'green' might be described as 'either the same general colour as grass OR a descriptor of anything of any colour that is the same as, similar to or absolutely nothing whatsoever like the colour of grass'! It does very much run counter to the whole purpose of language for communication and common understanding when words can come to mean absolutely anything or nothing at all.