Are OS X Security Updates Cumulative? I can't seem to find a definitive answer anywhere, but are Mac OS X Security Updates cumulative?

The update in question is 2015-004. I've checked https://support.apple.com/en-us/HT204659 but it doesn't list any requirements.

Background: I've just finished deploying 2015-002 to some of our iMacs (running Mavericks 10.9.5), but now I see that 2015-004 is out. I was wondering if there was any point in continuing rolling out 2015-002, or should I just deploy 2015-004?
I would assume not cumulative, based on 15 years on Mac, and continue with -002. 

Absolutely there's a point, one never knows what little fixes are included in each Security Update, nor what might be dependent on previous updates. 

Bite the bullet and play by the Apple book.