Difference between Multidrop and daisy chain topology
They are the same thing in terms of RS-485.  Electrically identical.  Multi-drop is the more accepted term.  

To put a finer point on it, daisy-chaining is a connection technique whereby one RS-485 adapter is wired directly to the next one, and so on.

The alternative connection technique (which would not be called "daisy chaining" is to have a common bus architecture, and just have each adapter connect to the bus).