Both the Supreme Lord and the living entity are known as atma. The Supreme Lord is called Paramatma, and the living entity is called the jivatma, or jiva as mentioned in Brahma Sutras and Upanishads below. See Page no. 82.
गुहां प्रविष्टावात्मानौ हि, तद्दर्शनात् ॥ Sutra 1,2.11 ॥
guhāṃ praviṣṭāvātmānau hi, taddarśanāt ||
The two that have entered into the cavity (of the heart) are indeed the individual self and the Supreme Self, because it is so
द्वा सुपर्णा सयुजा सखाया समानं वृक्षं परिषस्वजाते । तयोरन्यः पिप्पलं
स्वाद्वत्त्यनश्नन्नन्यो अभिचाकशीति ॥ १ ॥
dvā suparṇā sayujā sakhāyā samānaṃ vṛkṣaṃ pariṣasvajāte | tayoranyaḥ
pippalaṃ svādvattyanaśnannanyo abhicākaśīti || 1 ||
Two birds of beautiful plumage , who are inseparable friends , reside
on the self same tree . OF these one eats the fruits of the tree with
relish ,while the other looks on without eating.
The relative answer is provided in Parashar Gita found in - Mahabharata Shanti Parva -Moksha Dharma Parva - Chapter 291 - Verse no. 22. Where Rishi Parashara is explaining King janaka about your question. The meaning of the below verse is that no one Jivatma can affect other jivatma by his karmas , One jivatma can not get affected by good or bad deeds of another jivatma.He only himself suffers or enjoys the fruits of his actions and those can not affect other one.
नायं परस्य सुकृतं दृष्क्रुतं चापि सेवते |
करोति यादृशं कर्म तादृशं
प्रतिपद्यते || 22||
One never has to enjoy or endure the good and bad acts of another.
Indeed, one enjoys and endures the fruits of only those acts that one
does oneself. p. 347