From PhilPapers forum Philosophy of Mind:

2012-08-08
What would count as an explanation?
Reply to Bill Meacham
What logical fallacy is made here? - "So there is no way to compare my experience of a green tree with your experience of the same green tree." - which is "the same" green tree? Obviously our "different experiences" of the green tree are exactly the same!

Language is a public activity, as Witt would have it, not a private one. "The same" green tree evidences that.