^ I think the similarities that they have are the RNGs that they generate because they are the same that comes from a computer algorithm. I don't know regarding the provable fair but I think they have. No, they do not require technical or required skills, though you have knowledge on it and then you are fine because these games are based on luck that you are against to the house edge. However, the chances of winning depend on the percentage of odds and that’s only about changing the odds, but not picking specific possible winners and losers.