Near-duplicate content
What this means
The page's main content is highly similar to another crawled page's, compared with SimHash over main content only (navigation, footer and template markup excluded); byte-identical content is reported as an exact duplicate.
How to fix it
Consolidate the two pages behind a 301 redirect, differentiate the content substantially, or canonicalize one to the other if both genuinely need to exist.
Fix effort
This check needs review: the change can be drafted for you, but a person has to approve the wording or choose the target before it ships.
Authoritative source
https://developers.google.com/search/docs/fundamentals/creating-helpful-content
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