Does all coconut water have vitamin C?

I bought two different brands of coconut water. One said that it had over 100% of the RDA of vitamin C, but the other brand said 0% of vitamin C. Both listed under ingredients "100% coconut water" and no other ingredients. How is this possible, unless there are different types of coconut that have different vitamins. Or unless one of the manufacturers added vitamin C but didn’t list it on the label.
What do you think?

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