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First its the same actress. So if you liked her acting in the heir then you would absolutely love her here too. Both in these cdramas she starts in a century where women were looked down on and forbidden to engage in mens field. Here in Flourished Peony she starts her business from the bottom and strives to the top.

SSofFV is a far more compelling wuxia where the fighting make sense in the story and the choreography of the fights is so creative it is like dancing. ZZA seems to overly 'trigger' a fight every other minute (like Blood River) but starts to run out of steam in regards to storyline complexity at episode 12.

Things common in both dramas
-Soul swapped
-Royal & Innocent Male Lead
-Witty Female Lead
-Helping each other

In both dramas, main leads have misunderstandings about each other other but when their soul swapped they gradually understood each other and had each other's backing.

Both of these are gay romances set in the underworld of a big city. The vibe of both is rough and rugged, with themes of violence and survival in difficult world.

Both dramas story lines almost 100% similiar to each other. Both had items that lead and connect from modern time to ancient time and vice versa.

The different only that 1st VD (male lead Peng Yu, female lead Liu Qi Ting). the one from modern time is male lead as young Taoist Priest Chu Chen who send goods and supplies through an ancient box to female lead Empress Dugu Yue from ancient time Zhou Dynasty.

2nd VD (male lead Wang Yu Wei, female lead Li Ke Yi), the one from modern time is female lead as Lin Wan Yu who send goods and supplies through ancient gold bowl to male lead General Huo Yan from ancient time Yan Dynasty.

What a Good Girl and She Was Never a Good Girl are two different adaptations of the same story, with the former being the Chinese remake and the latter the Korean version.

1)Woman is trying to do business in the past,
2) from a big business family
3) independent business woman in the past

Both TW and SGBS feature plots heavily surrounding super hero abilities and have genres that include fantasy, action, comedy and romance. SGBS is more of a romantic comedy first however whereas TW has some romance sprinkled in but the main elements of the show are the group relationships, comedy and action,

Both are Korean dramas that feature characters with superpowers that have downsides.
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Both are short Korean dramas with soothing vibes and a seaside, small town setting. Both have a summery setting and chance encounter between the leads.

Both are Korean culinary competitions.
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Both are slice of life with a melancholy tone and a subtle BL love story. Both MLs face difficulty and tragedy in life, a long separation, one of the MLs marrying/being romantically involved with a woman, and a final bittersweet reunion.

Both have similar vibes and a subtle BL plot. Both leads are drawn to each other but suffer tragedy and setbacks leading to a separation during which one of the MLs marries.

Both of these dramas are super cute, follow a group of friends from high school until their early adult lives.
imo the main couple in a river runs through it isn't super obvious until the very end but they're great friends the whole way and they always support each other through everything.

you should definitely watch both of them :)