SEP v SSEA
Whopity, there isn't any difference between the two. They are both the same with different names simply to deliniate between the rating being held by a NPPL holder and a PPL pilot.
The NPPL licence held restricts the privileges to aircraft maximum weights less than a PPL and the number of passengers etc (without any reasonable logic).i.e the NPPL may fly a Piper Saratoga with six seats but only have 3 passengers. The aircraft can be flown at maximum weight but with the two spare seats occupied with anything but not with people.
The exemption as it is now is perfectly reasonable and clear. There can be no justification to require an expensive adninistration process.