Mental doppelgänger 

When to people don’t share similar physical traits but instead share a similar train of thought and emotions therefore thinking alike

Her and her sister are mental doppelgängers because the think alike a lot.

Mental doppelgänger by Goat are animals June 5, 2024

Mental-Doppelgänger 

Two people who do not look alike but are the same person.

Mental-doppelgängers share extremely long list of things in common, including weirdly random things and being able to finish each other’s sentences perfectly

Mental-Doppelgänger by JT9878 January 21, 2019