The Hadith to be considered is:
It was narrated that Jabir bin ‘Abdullah said: “The Messenger of Allah
(ﷺ) said: The best rows for men are the front rows and the worst rows
are the back rows, and the best rows for women are the back rows and
the worst are the front rows.”
So before a prayer starts, above is the recommended sequence.
First of all the numerations in hadith books have been made by editors so each Edition might use a different numbers for the same hadith. Also note that some hadith books have been rearranged by commentators so each commentator would follow his own numeration.
Secondly you may find in Sahih al-Bukhari at least two narrations on the authority of 'Aishah ...
Note that numbers are a poor reference for ahadith as they differ with the publication. Also it is difficult to find something in the Musnad from translation of the content alone.
Possibly you are referring to this hadith:
عن معاذ قال: عهد إلينا رسول الله صلى الله عليه وسلم في خمس من فعل منهن كان ضامنا على الله: من عاد مريضا، أو خرج مع جنازة، أو خرج ...
Abu Az-Zinad أبو الزناد is 'Abdullah ibn Dhakwan عبد الله بن ذكوان a scholar of fiqh and hafidh of hadith from Medina who was born before the death of ibn' Abbas and met Anas ibn Malik and ibn 'Omar, so he is a (young) tabi' y. He died in Ramadan 130 a. H. among his prominent students you may find imams such as Malik, al-Laithi ibn Sa'as and Sufyan at-Thawry ...
Al-A'raj refers to 'Abdurrahman bin Hurmuz (عبد الرحمن بن هرمز). You can read his entry in Dhahabi's book "Siyar a`lam al-nubala", published by Muasisatur-Risalah: Volume 5, Page 69-70
Abu'z-Zinad refers to 'Abdullah ibn Dhakwan (عبد الله بن ذكوان), you can read his entry in the above reference: Volume 5, Page 445-451.