I agree with Milingu that the Vieja is probably not a bifasciatum, but looks fenestrata. The other is most definitely pearsei.
The main characteristics of bifasciata are 2 bands along the flanks, one running from the gill plate to the base of the tale, another more of a blotch, and irregular just below the first lateral line. Below an example.
The individual I had above, was from Rio Chacamax (If I remember right)
The upper blotch is not quite as visible when young, but there nonetheless