Most of these people don't even have dysphoria, they just dress and act a certain way. It reminds me a lot of my friend who clung to her INTP type all the way through high school. She related everything she did back to her Myers Briggs type. It seemed to define her entire being... just like the enbies who're so obsessed with their masculine and feminine "energy."
However, while personality tests are treated like a stupid girl thing, gender identity is seen as legitimate. They're both based on feelings. Both groups also love to affirm how much they align with their personality type, astrological sign, gender, etc. Preteens/teenagers tend to cling to any sense of identity or label that even moderately describes them. The big difference is that one of these groups has "professionals" grooming kids into irreparably damaging their bodies, and the others do not.