Question about Puppeteer and Siegebreaker

The Siegebreaker belt has an effect of spreading caustic ground worth 20% of a minion's max life in dps on their death. The Puppeteer's Putrid Conscription has the same effect, though at 30%. I was wondering if these effects stack together (dealing 50% of the minion's max hp/second), or if they're independant (so the Siegebreaker's effect turns off, as only the larger effect applies)?

The main reason why I'm asking here is because I don't really know how to test it. Since it relies on Minions (and on their death, at that), there's no real tooltip in-game to see if they're stacking, and I can't exactly see much difference in damage on the enemies since nothing can live long enough to serve as a reasonable control. PoB doesn't seem to be much help either here since I can't see any indicator for Putrid Conscription's caustic ground, so I don't see a way to sim that with/without Siegebreaker.

Yes they stack.