While still being distinct terms. And is there a term for this? Hope that’s enough to go on!
When we sleep can our self sleep...?...sleep holding on to our ego tightly...? Can you say your self changes if there is a change in knowledge?
The soul is usually called the Self. If you like perennial philosophy, I invite you to read the Bhagavad Gita.
The changes occur after knowing about something (change in knowledge) may be in your perception, emotions, thoughts, attitudes, behavior, etc.; but not in the soul. You will see its explanation in the second chapter. Soul is always pure. No purification is needed to it. It is a misconception to say that the soul changes.