Short answer
No. Other users aren't shown any connection between your Nex and your Nyx. Their profiles, followers and posts are kept separate, and your account email is never shown on either one.
What Nixyum can't control is what you reveal. A reused photo, the same username, a shared contact email or a detail only your friends know can give you away. See “How do I keep my Nyx separate from my Nex?” for how to keep them apart.
Trying to unmask someone else's Nyx is against the Community Guidelines, whatever method is used.
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