The languages are the same, but there are other differences like the placement of ALS and the fonts.
2002 and 2014 have the same language and the same differences but are listed separately.
2003 and 2015 have the same language and the same differences but are listed separately.
2004 and 2016 have the same language and the same differences but are listed together.
That's an inconsistency that should be corrected. It's already reported here
https://en.numista.com/forum/topic61278.html (scroll to the posts of 29 and 30 October), but not corrected yet.