difference between pacu

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Black Pacus are black there whole lives, redbellys are red when small and as they get bigger they get darker. Sometimes they stay red.
 
From what I have read, it seems they both get about 4 feet in the wild and over 2 feet in captivity. How much of a growth difference is it? I see more sites saying the red belly gets bigger than the black. I have 2 red-bellys and they are eating machines. All of my food instructions say to put only the amount of food they can consume with 2 minutes. That would be the whole bag and some!
 
I've also found that the blacks tend to have a quieter disposition - not as nippy as the red bellies tend to be. I've heard that blacks live longer, and get bigger than the red bellies.
 
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