Wechat third-party platform UnionID

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We have developed a third-party platform for Wechat. Because of business needs, we need to associate users of official accounts with users of Mini Program. There are multiple official accounts under the platform. May I ask two questions
1, is the official account of the same subject the same as Mini Program"s unionid
2, and whether the official account unionid of different subjects is the same

Wechat-official-account-developed Mini-Program Wechat-open-platform

Mar.09,2021

unionID bound to the same open platform are all the same.
but each openID is different.

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