Relative hormone levels can play a role in people's attractiveness, smell, ect, but how those hormones affect behavior probably plays a larger role than any physical changes others can observe. A transfem seeking out sex because she's horny would have a bigger impact than her looking or smelling better.

Sapphic transfems being so lascivious likely has more to do with us finally feeling comfortable in our bodies and sexuality, combined with having to go through a second puberty. On top of that, all sapphics tend to be more lascivious than hets.