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"To begin with, the parallel verb in both clauses is "have," so beginning with "have" both times is essential.
Another example:
I have been to Paris, but I have not eaten snails.
Additionally, the word "not" never precedes the main verb. We say "I have not," "I do not," etc., and never "I not have" or "I not do." If not precedes these words, it is because it is modifying a preceding verb:
I do not have time to eat lunch.
I do not do yoga.
The "not x but y" structure you mentioned is used in many contexts, but is not generally used to compare main verbs. Here are a few examples:
The drug is not helpful, but harmful."
以上是官网上的解释
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