  In our contribution we study stochastic models in one space dimension with
two conservation laws. One model is the coupled continuum stochastic Burgers
equation, for which each current is a sum of quadratic non-linearities, linear
diffusion, and spacetime white noise. The second model is a two-lane stochastic
lattice gas. As distinct from previous studies, the two conserved densities are
tuned such that the flux Jacobian, a $2 \times 2$ matrix, has coinciding
eigenvalues. In the steady state, investigated are spacetime correlations of
the conserved fields and the time-integrated currents at the origin. For a
particular choice of couplings the dynamical exponent 3/2 is confirmed.
Furthermore, at these couplings, continuum stochastic Burgers equation and
lattice gas are demonstrated to be in the same universality class.
