The quest Seductive Fragrance (v2.91) says:
"Lotus Perfumes can be gifted to women (only Erevi currently) for an affection boost. Either perfume can be used to attract bat breeders."
You're using Alpha Male musk glands in both and that's what BBs are reacting to rather than the other ingredients, so both working on them makes sense. As for the "pet" she's already horny nearly all the time, subject to Affection level...maybe an image of her being VERY forward if he's used either perfume, switching to an appropriate existing sex cutscene/animation?
I suspect the difference wasn't implemented correctly in the game. I believe I recall people saying they can make Sun Lotion 2 for Birgitte using Nocturnal perfume, when it should be Lotus.
As for different people liking different scents, fair. I've never, ever liked patchouli but one of my sisters loves it. I think the difference is more for gameplay distinction than IRL simulation.