The new papers are only supplied to Examiners after they have returned the old papers, so nobody will have both sets!
The syllabus has not changed, so it should make no difference to the student, unless they are being coached to pass specific questions!
The purpose of the exams is to ensure potential pilots know sufficient to operate safely, not to be ticks in a box.
The 4th question is to fully align the papers with JAA examination requirements.