Coke Zero and Diet Coke

I know from source. Coke Zero is sugar free (except USA,Canada,Taiwan, where it's kalories free) version of Coca-Cola with as small as possible changes in flavour. Coca-Cola Light or Diet Coke is soft drink with aim of being low caloric and low on sugar that is not supposed have a taste of coke. It's just different drink, like sprite.

as what i have known diet coke has less calorie but still got sugar in it. while coke zero has no sugar, still less calorie. i dont know the whole specification of both the diet and zeero. but i rather have the zero though it taste odd, but still its coke. so its fine with me. as long it does not have much sugar. but still i dont know if what ive posted here is the right one. jhelai

I think they are both calorie free but the zero has no caffeine too.