Is it correct?
1. These prices remain the same for both cases or they have to be changed?
No. I am not certain what you are trying to say. The sentence has a question mark, but the wording is not that of a question.
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No. I am not certain what you are trying to say. The sentence has a question mark, but the wording is not that of a question. Perhaps you mean something like this:
Do these prices remain the same for both cases, or do they have to be changed?