With NECA, it's all about getting the most sales from the parts they make as possible, that's why they do variants with subtle differences in accessories or paint, or two-packs like this. They sell things off many ways to get the most of the cost to produce the piece. They're redoing Rocky and Apollo because the new skin has paid off for them so it gives them a unique quality to try and sell these again to people with the originals as well as those who missed out. Given the price of the figures and market, this sort of practice makes sense and is common, Hasbro does it a lot with Star Wars.