I don't deny that they may agree with you, but as they are not inside your head, and you are not inside their head, you cannot actually say that you know you feel the same.
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Well, if that is your standard for "knowledge" then we can know nothing. Since we cannot get inside another's head to find out if blue to them feels the same way blue does to us, we can't "know" if the color blue exists.
No, it's not the same.
We can analyse the light waves and find that what you call "blue" and what another percon calls "blue" fall in very similar places on the spectrum.
There is an objective measure, from physics, for color, but there is no objective measure for feelings.
I am not sayingthat feelings cannot be generally agreed upon, but you cannot feel what another person is feeling, and there is no way to verify it from an outside source. It is internally-produced opinion.