Yes, the first is Nimbochromis livingstonii. The second looks like it is Aulonocara sp. (commonly grouped as peacocks). I, however, will not jump to the "it's a hybrid, it's a hybrid" conclusion. With all of the dozens of variants from the lake, that could easily be a natural fish. It could also be a hybrid. Even when it gets to be full adult size you'll never know for 100% what it is other than a "peacock".