Apart from the character designs, I really get the vibe from Citrus in this manga.
The similarities I found were:
Miss Sunflower's stern attitude and Matsuri's frank (i.e. Telling MS how much she loves her) and irrational behaviour. Much like Mei and Yuzu.
Miss Sunflower gives the vibes that she's into Matsuri but never really does anything about it. She just goes with the flow, although she knows Matsuri's into her.
Miss Sunflower is following the past Miss Sunflower's foot steps; Mei follows her dad's foot steps. Both has something they want to do.
Ahaha. I know a lot of Citrus haters in dynasty, so please try not to heavily bash me when you read this comment! I was just stating some of the things I found similar between the two.
Although I prefer Miss Sunflower tenfolds than Citrus, I still think the latter is of at least a mediocre quality in regards of the story.