Mochiron, Isharyou Seikyuu Itashimasu!
Naturally, I Demand Restitution!

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The MCs are pretty similar (and not only in appearance), they are both very smart and own their own business, not focusing that much on romance and yet ending up loved by everyone (almost). Although Mochiron isn't exactly and isekai like Koushaku, where the protagonist is reincarnated as the villainess of an otome game, it's very similar as you'll find out from the first chapter. Both girls are also part of the nobility, and their love target ends up being a prince (or more like they become the love targert of the princes). They also both have loving families. For both works the demographic is shoujo.