User blog comment:Derax-Pagani/Chapter 509: Kagura vs. Larcade Review/@comment-7418318-20161107191643/@comment-7418318-20161108064901

Makarov strongly hinted at (pff... hinted... he outright said so) that Mavis currently regards the FT members as only soldiers for this war.

This is pretty much the same way in which Zeref views all of Alvarez, though he takes it a step further by seeing them as gaming pieces, instead of soldiers. For him this dehumanization of his subject and allies worked to keep him from firing off death waves left and right.

Since their methods are similar, their results should also be similar. Though I still think that Mavis curse is not exactly the same, after all she didn't kill anyone else with her curse prior to Yuri's wife and back then she valued life a great deal. Thus I think the mechanics behind their curses or at least the intensity/sensetivity are different to at least some degree.