Hi, Raychatu!
Yes, I would say those are all approximately the same in meaning. I've tried to map out the differences below. Hope this helps!
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"This is new to me" suggests that you're getting that information for the first time and that it was previously unknown to you.
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"I did not notice" suggests that the information may have been available to you before, but you were unaware of it until just now.
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"I did not know" suggests precisely that--you did not know before, but you do know now.
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"I am just finding out" suggests that you're in the midst of getting information that you previously did not know.
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"I was not aware" suggests that you are now receiving information that you did not have before.
As you can see, the meanings are all broadly similar, and most phrases on the list seem to generally indicate that you are now aware of information that you previously did not have.
I hope that helps! Let me know if you have other questions.