This question already has an answer here:
- What to do with cross-site duplicates? 6 answers
There have been many questions that ask if a user is allowed to cross-post a question on multiple sites, and the general conclusion is that they are not allowed to do so. However, sometimes there are questions which are asked on multiple sites by different users not knowing another SE site had an answer already, where it is on topic on both sites, that have some overlap. What is the policy for such questions? Should they be closed on one site, migrated, or is each site independent enough to allow the question to remain on both sites?