A person separated the Zakat al-Fitr and later he paid a different amount to a poor person as Zakat al-Fitr…

A person separated the Zakat al-Fitr and later he paid a different amount to a poor person as Zakat al-Fitr without paying the originally separated amount. What is the ruling in the following cases: 1.If this was done out of ignorance of the ruling and then he became aware of the correct ruling either before or after the noon on the day of Eid? Does the ruling differ if the ignorance was due to negligence or not? Does the payment suffice, or must the separated Zakat be given? 2.If this was done out of forgetfulness and then he remembered the ruling either before or after the noon on the day of Eid, does the payment suffice, or must the separated Zakat be given? 3.If this was done intentionally with knowledge of the ruling, does the payment suffice, or must the separated Zakat be given?