Would this actually count as an in-franchise crossover? Genshin and Star Rail aren't supposed to be connected, even if we go with Imaginary Tree lore.

This would probably fit more as a company connection.

Both are smart.
Both have a sort of robotic minion (although robotics is Sandrone's field, while Madaam Herta has an army of literally iteration of her younger self)
Both has sassy personalities.

The difference is Sandrone has a petite with squishable parts, while Madaam Herta is slim yet very sexy (and cute) bodyfigure.
Both are seggs.