They are identical in regards to composition. The difference being in the press to form the pellet making the density slightly different between the two
I start pups out on carnivore (crack) because is softens quickly and is small enough for their mouths. I quickly transition to cichlid gold as soon as they have put on a little size. It's significantly less expensive but the pups have to be a bit larger to take it. I try to avoid massivore as adults. That is solely due to cost though and my personal preference.