Some are some aren’t. It’s probably closest to the mid 20th century American concept of transvestite, which at the time encompassed everyone from transsexuals (at that time the medical definition of transsexual required what we would today describe as severe dysphoria and exclusive Heterosexuality) to the more modern definitions of trans people, both binary and nonbinary, as well as cisgender crossdressers of all varieties. Source
Ladyboys aren’t dudes, though.
Some are some aren’t. It’s probably closest to the mid 20th century American concept of transvestite, which at the time encompassed everyone from transsexuals (at that time the medical definition of transsexual required what we would today describe as severe dysphoria and exclusive Heterosexuality) to the more modern definitions of trans people, both binary and nonbinary, as well as cisgender crossdressers of all varieties. Source