CFA Level III 2015 books VS 2014

Does any one know why CFA level III 2015 books have lot lesser pages than 2014 books ? Sorry if it is discussed before. I was searching but coudn’t find a good answer.

CFA Level 3 Curriculum: 2014 Vs 2015

2015 Material Changes (Level 3)

No. Of pages in 2015 Level 3 Curriculum