How to handle duplicate question, where it's on different Stack Exchange sites?
105400
What should we do about *identical* cross-site duplicates? (i.e., copy-and-paste cross-posting)
106883
Auto-flag duplicates of deleted questions for reopening / deletion
11295
What is duplicate content and how can I avoid being penalized for it on my site?
146225
Duplicate questions on other SE sites?
102097
How to find all questions that were duplicates of another question?
77534
Best practice for marking own questions that could belong on another/multiple sites
135386
Should bug-report/feature-request *questions* that duplicate Grab-bag *answers* be closed as duplicates?
89289
Show unanswered questions in the duplicate dialog on meta sites and in other cases where choosing an unanswered target is allowed
87154
What to do if an out of date question+answers already exists?
139852
Dealing with suggested edits on question to be closed as duplicate
143078
Is there a way to migrate a question to a SE site not on the "belongs on" list?
81134
What decides what to prepend the duplicate question list with on a duplicate question?
130860
What to do when your question has an old, stale, unanswered duplicate?
28009
Is it acceptable to move questions without answers between sites?
18056
Are there any clones/alternatives for running a Stack Exchange style Q&A site?
16251
I accidentally marked the wrong question as a duplicate. How can I replace it with the correct duplicate?
3426
What is a "closed" or "duplicate" question?