The overwhelming majority of cross dresses are hetrosexual males that dress for a variety of reasons ranging from sexual fetishes to female illusion.
Transsexuals whether that be FTM or mtf examples are defined as having GID.
Gender identity disorder (GID) is the formal diagnosis used by psychologists and physicians to describe persons who experience significant gender dysphoria (discontent with their biological sex and/or the gender they were assigned at birth). It describes the symptoms related to transsexualism, as well as less severe manifestations of gender dysphoria. GID is classified as a medical disorder by the ICD-10 CM[1] and by the DSM-IV TR.[2].
Many but not all Transsexual people are driven to transition from one gender presentation to the other.
Cross dressers have no medical diagnosis or descriptive concerning their "need" or desires concerning wearing cloting of the opposite sex.
They do however have a mental disorder diagnosis.
Transsexual people ave little in common with cross dressers other than perhaps clothing.
I'm intersexed and exist in a different classification due to biologically having attributes of both sexes.
Julia