As adjectives the difference between cisgender and heteronormative
is that
cisgender is identifying with or experiencing a gender the same as one's biological sex or that is affirmed by society, e.g. being both male-gendered and male-sexed while
heteronormative is of or pertaining to the practices and institutions that legitimize and privilege heterosexuality, heterosexual relationships, and traditional gender roles as fundamental and "natural" within society.