substance diualism claims that there are 2 types of substances; mind and body, and these are ontologically distinct from eachother and they do not rely on one another.
interactionalism claims the mind affects the body and the body affects the mind, there is a 2 way interaction
whereas compared to epipheomentalism which claims the physcial effects, there is only a one way interaction between these properties
epiphenomentalism and interactionalism are similar as they are both under substance dualism, an exmaple of this is seen through mental states are like smoke coming out of a steam train; the steam is a consequence of the physical