This hadith has been narrated by A'mash with the same chain of transmitters.
Sahih Muslim Book 12, Hadith 104
← Previous Hadith When a woman spends (something as Sadaqa) out of the household of her husband without causing any damage, there is a reward for her and for him too like it for whatever he earned, and for her (for the wife) because of her spending (for the sake of Allah), and for the trustee also (there is a reward like it), without any reduction from their rewards.

Sahih Muslim Book 12, Hadith 103 Next Hadith → I was the slave (of Abi'l-Lahm). I asked the Messenger of Allah (ﷺ) if I could give some charity out of my master's wealth. He said: Yes, and the reward is half and half between you two.

Sahih Muslim Book 12, Hadith 105