I don't think the main difference is because the women aren't identifying as men. I've just come across another case concerning a woman who identifies as a transman.
https://www.gbnews.com/news/trans-male-who-had-sex-with-three-women-using-specially-made-prosthetic-penis-convicted-of-assault/304730
Both Tarjit Singh and Carlos Delacruz identify as 'transmen', but were still convicted. Singh was jailed for 10 years.
This story is more representative of what happens to males who identify as 'transwomen' and trick other men into sex:
https://www.espn.com/college-football/story/_/id/33995352/former-virginia-tech-football-player-isimemen-etute-found-not-guilty-death-blacksburg-man
I found both of these cases via this article by Mary Harrington who says:
Ismiemen Etute, a Virginia college athlete, beat Jerry Smith to death after discovering he’d posed as “Angie Renee” online to obtain sexual contact with Etute. Etute was acquitted on self-defence grounds, but the sexed difference between this case and that of “Tarjit Singh” is striking. Singh’s victims were first guilted into continuing sexual contact, before eventually calling the police; Ismiemen Etute returned to the scene and beat Jerry Smith to death. Meanwhile when faced with moral pressure for sex by males identifying openly as the opposite sex, lesbians find themselves on the defensive: forced to justify why their same-sex attraction is not bigotry.