What is exact difference between run across and run into phrasal words is it necessary run into always use for non living things and run across is used for generally which purpose

'Run into' and 'run across' have interchangeable meanings when they mean 'meet someone by chance'.
For example: I ran into my friend from college.
They ran across their old football coach.

But, 'run into' also means literally running into an object or colliding with it.
For example: Ryan ran into a pole and hurt himself.