Horizon's sprite is ever so slightly taller than Hilde's sprite. And doing some rough math using pixels comparing sprites with Seo Yoon (canonically 168.5 cm) as the measuring stick, Eins & Zwei are 119 cm, Horizon is 146 cm, Hilde is 143 cm, and Yang is 144.5 cm. Oh and Alex is 173 cm.
Edit: I might be shorting EinsZwei, Horizon, and Hilde by about 2 cm just because of their stances, so feel free to add 2 to those three's numbers. Edit2: Out of boredom, I went looking for the tallest girl in the game: it's Maria at 183cm