1stly zinc is an immobile nutrient. And tends to show itself in new growth. And wouldn't account for the whole plant been of a lighter shade.
Really, tbh. I think you just have a pale girl. As N would be sucked from older growth, making it a mobile nutrient, (which means, your plant will go to older growth to get the N it needs, and will show itself. I might be wrong. As I don't have have coco down fully yet. But, gen, if there was an issue. I wouldn't be looking at such a uniformed issue. As it's all the same, and looks healthy. I think it's just a pigment issue. So,
No, pheno, (grow from a seed) will act similar..
I just don't see any issues.
With an EC that high. It's gonna be an Issue. More really doesn't result in more yields. What's most important is that she eats what you give her. And giving such high doses of nutes to an issue, well that's not an issue will cause them.
Good Growing