Yes, whatever you enter on Form 4868 will be sent to the IRS. No, the extension will be accepted if you receive acceptance. The reconciliation will occur when you file your tax return. It will not be null or void.
No the IRS will accept your payment and will not consider it unreasonable. All fines and penalties are based on tax balance due so if you should have a refund in the end, there is no reason for concern of overpayment of estimated tax.
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