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We demonstrate that two very different non-equilibrium systems: incompressible flocks(i.e.,the ordered phase of incompressible polar active fluids,in which the time-averaged velocity is non-zero)in two spatial dimensions(2D)without momentum conservation(i.e.,moving on a surface),and growing 1+1-dimensional interfaces(i.e.,the 1+1-dimensional KPZ equation),in fact belong to the same universality class.