If a faction executes an operation in more than one region, can it perform a different special activity in each region
, or is it limited to only one 'type' for the whole operation?
More accurately, you may only execute one Special Activity for each (non-Limited) Operation you execute. A single Special Activity can never be of different types to itself.
Just like a single Operation can occur in more than one space, a single Special Activity can also occur in more than one space if its rules allow it.