These phrases are not the same as they have different meanings.
What is the meaning of each sentence?
- "I did not notice" means that information was available to you, but for some reason, you did not know about it.
- "I did not know" means that you didn't know about something, but now you do.
Although similar, each phrase is used at different meanings as they imply different situations that should not be confused.
However, the two sentences have a similarity, since both are formed by an independent clause.
Learn more about independent clauses:
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