Sorry if this has already been asked, I did search before making this post... I promise

I was wondering, if Breeze Dancers 40% Wind Enhancement, stacks with Gaara's 40% Mastery?? He does it at the start of the battle much like her, i'm not sure if its bringing the total up to 80% or they are just refreshing off each other. If they are just overwriting the duration, it gives me a free talent spot I suppose lol.