YES

TRS:

  f(g(f(a()),h(a(),f(a())))) -> f(h(g(f(a()),a()),g(f(a()),f(a()))))

max/plus interpretations on N:

  f_A(x1) = max{6, 12 + x1}
  f#_A(x1) = max{6, 12 + x1}
  g_A(x1,x2) = max{20, 5 + x1, 20 + x2}
  g#_A(x1,x2) = max{20, 5 + x1, 20 + x2}
  a_A = 0
  a#_A = 0
  h_A(x1,x2) = max{35, 39 + x1, 2 + x2}
  h#_A(x1,x2) = max{35, 39 + x1, 2 + x2}

precedence:

  g > f > a > h