Some Material Opacity issues I think

I am trying to try out the Niagara system from a tutorial. When I am supposed to use a Material Function Called MatLayerBlend_OverrideOpacityMask2, I used the MatLayerBlend_OverrideOpacityMask, which is the only one I can find. Resulting in an extraneous node “Mask”. Is there anyway around this problem? Thanks.