XZC is the first сoin built on the Zerocoin Protocol, which provides users with full confidentiality. Zcoin is separate from other crypto utilizing the Zerocash platform. Zerocash is an offshoot from Zerocoin, their respective implementations are not simple forks of each other but rely on different cryptographic assumptions with various tradeoffs. Both approaches supplement each other quite nicely, and a good way to describe them would be as sibling projects.
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