It's confusing! All from the Aulonocara genus. Honestly it's very hard to tell the difference from that pic at that age (If at all). Just let him color up and then you can make the call. They are very very close. Here is some data from cichlid profiles. Basically it comes down to which island they originated from
The Geman Red Peacock is not a hybrid but has been line bred from the Chipoka race of Aulonocara sp. ''Stuartgranti Maleri".
The Ruby Red Peacock is not a hybrid but has been line bred from the Maleri Island race of Aulonocara sp. ''Stuartgranti Maleri". It was named Rubescens after Peter Rubin, who first imported this fish from Germany.