Flourished Peony

In both, ML is very influential, but lets FL figure out their own way. He only helps when asked or needed.
FL is head strong and independent, fighting for her way no matter the costs.
In flourished peony, FL tries as hard as she can to escape her marriage and ends up faking her death.
In the autumn ballad, FL "husband" dies on their wedding day and the in-laws try to force her to die with him, but FL fights her way out of that situation. (she also fakes her death at some point lol)
There's probably many other points, but overall similar vibes. Only main difference is in the autumn ballad, ML is prejudiced against FL and vice versa (lots of bickering), in flourished peony, FL is a bit prejudiced at first (she's not sure whether ML is a good guy or not), but overall it feels like there's mutual respect and understanding.

ML helps FL's business.
They do fake marriage
Focus first on business and then on government
FL has ambitions in her business
ML has goals against rebellion in government

ML is a government official undercover
Brocade Odyssey : Brocade Official
Flourished Peony : Official of flowers and birds
FL owns a business that helps ML
ML married FL to save her
Friends become lovers
both in the Tang Dynasty era

- Both FL have been married before
- Both FL are smart and intelligent, and overcome the (many) difficulties that come their way.
- Both ML are powerful and help the FL

*The Double is a little more focused on revenge, while Flourished Peony is more focused on personal and professional growth, but the dynamics between the leads are similar.

If you became a fan of Yang Zi from Flourished Peony, I definitely recommend you watch one of her famous shows, Ashes of Love. Of course, the main lead is Yang Zi with two other men. EVERYTHING is amazing in Ashes of Love. The acting, the plot, the scenery, the ost, etc. Everyone's acting in that show was absolutely phenomenal especially Yang Zis. If you're a fan of Yang Zi and her acting skills, go try Ashes of Love.

Prince Murong Jing He of the Great Yan Dynasty reclaims Qingzhou, but after his victory, a fire destroys the city. Accusations spread that he ordered the destruction in retaliation for a perceived betrayal, earning him the title of "Butcher General." In the chaos, Mei Lin loses her family and vows revenge. She joins the Shadow Works, enduring harsh training to become an assassin. Her first mission is to kill Murong Jing He, and she infiltrates his court disguised as one of the Xiyan beauties. However, she discovers that the mastermind behind her mission is none other than Murong Jing He himself.

(Source: MyDramaList)

~~ Adapted from the novel "Chun Hua Yan" (???) by Hei Yan (??).