The Legend of Jin Yan (2020)

In Both drama :
- two princes fighting for a girl
-the FL sister love one of the prince and hate the FL

Both female leads have similar strong personalities, so they don't give up easily in what they like doing.

Both dramas feature a FL and ML that have an arranged marriage, before meeting face to face they both refuse to get married, ending up with one of the leads marrying another (In TLOJY the ML marries her sister and in PS the FL marries a general).
But the two fated leads later meet and begin to fall in love without knowing the others true identity, in these parts of the dramas the FLs conceal their identities (In TLOJY the ML also hides his identity though).
Once the couple realizes their lovers true identities and their true feelings for each other they go through a lot of struggles so that they can marry each other, after a lot of failures they finally have their happy ending :)

Disguised FLs' identities. Suspicious, paranoid but powerful MLs. Both are kings of their territories. Silly and kind FLs. Both MLs have brothers who are ally/adversary. The brothers of both MLs are in love with FLs. Both MLs lose original wives to some hidden schemes.

cute and free spirited FL and domineering ML that have money and power. But TLOJY have good ending while LotDP not really good ending.

Both stories feature:
-palace intrigue
-a FL trying to help her sister
-dreams that may/may not see the future
-hidden identities

There's also a tone with both pieces--serious but not so much so there aren't moments of levity and sweet romance. (Although to be fair, the ML in Q:L&W is more romantic than the ML in LJY.)

First male lead is powerful and feared by all. Female lead disguises as something else and sneaks into the man's mansion. After various mishaps, they fall in love with each other. The ML has a brother who is also in love with the female lead. He helps her whenever she gets into trouble.

Both these dramas show the FL and ML with chance meeting and not knowing each other's real identity - which is funny since the FL treats the royal ML like a commoner - of course this helps them develop the relationship
Both dramas, the bodyguard is an unwitting ally
FL serves at side of ML in an effort for ML to keep them around - even though it is not looked on as okay by others
Both, Bickering-type dynamic and both FL always getting in scrapes with the ML saving
Bodyguard is the coolest character in both dramas
Jinyan is MUCH lighter and not as well made
If you like Jin Yan, Moonlight is a much better interpretation of a similar storyline

Male and Female leads have not discovered each other's real identities for more than 10 episodes. Male lead has brother who is also in love with female lead. Male lead is suspicious of brother. Mother of male lead is also the antagonist helping the brother.