The ruling on whoever left off sacrificing an Animal due to Ignorance
Question :
A man performed Hajj and Umrah together and he performed all of the rites of Hajj. During the days of Mina, he slaughtered an Adhha sacrifice (i.e., for 'Eidul-The Book of Hajj Rites Adhha), but due to his ignorance he did not slaughter a sacrificial animal for Hajj until the days of Mina ended. Does he have to slaughter a Hady animal (for Hajj)?
Answer:
If the matter is as you have mentioned, he must slaughter a sacrificial animal for Hajjul-Qiran in Makkah. He may eat from it and he may appoint a trustworthy person to slaughter for him in Makkah Al-Mukarramah. That which he slaughtered with the intentions of the Adhha sacrifice does not suffice him.
Source:
The Permanent Committee
Fatawa Islamiyah, Vol. 4 Pages 273-274