I say, and with God's success: If he performs ablution before sunrise, he cannot pray the Duha prayer after sunrise with this ablution; because he is someone with an excuse, and a person with an excuse has their ablution invalidated when the time has expired, and here the time for Fajr has expired. However, if he performs ablution after the dawn has broken, he can pray with this ablution before sunrise. Refer to: Sharh Al-Wiqayah, p. 129, and others.