Again, I think its fine if they were different wampas of perhaps even different sexes. Like the female hunts while the male eats at home, like lions, but the horn differences more like the difference between cows and bulls.
I know this has been beaten to death, but wouldn't it be easier just to remove the horns from the later "inside the cave" shot
and have the wampa keep the 1st image appearance? Those horns just don't work!