Wechat third-party platform UnionID

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

?

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

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1be711e-30ba7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1be711e-30ba7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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