The XML schemas are not the same for 3.1.2-0 and 3.3.0-13
For a 3.1.2.0 export you must validate with the schema for 3.1.2-0
For a 3.3.0-13 import then the XML must be transformed to the 3.3.0-13 schema
The difference between the two schemas might give you a hint which attributes/elements must be added.
There is a discussion on this problem on Request for comments: Deprecate the "Native Import Export Plugin"