These two share a lot of similarities: both main girls are energetic, dreamy girls which their goal is to marry. In both there´s a love triangle between the main girl and two half brothers that are princes. Also, the main girl is the only descendant from a noble family that committed treason to the royal family, and so, were banished and killed. Also, the main girl has a box from her ancestor and ends up working some time as a maid for one of the princes. Many comedy and romance.
The stories are both about Royal Brothers and a girl who seems to be a commoner but may be from a traitorous (and related) Royal line. In both Stories they fall for her. Both stories include lots of pretty frilly clothing. MeruPuri includes magic while Prince is a bit darker.
Romances with royalty and political intrigue. A Kiss to the Prince has a medieval setting while Zettai is a more modern fantasy setting, liike perhaps a style from a hundred years ago. Zettai Heiwa Daisakusen has more politics against the couple while A Kiss to the Prince has other royals interferring.
It the beginning the main character, Usagi Tsukino, and the Sailor Soliders are searching for the Moon Princess. They believe it to be Sailor Venus, but later find out it's someone else. The girl in question does not realize she is in fact the real princess. The beginning of the story deals majorly with finding the princess and the her coming to terms with her duty.
Both have girls who were raised up as a commoner but later on, they were told to be the last of their house and the last remaining heiress to the house and the servants also wished for the revival of the house. both also have princes who are half brothers.
although RxJ has a bit violence than a kiss to my prince
Got some similarities between the two stories, but lots of differences there as well... Hadashi de Bara wo Fume is less cutesy than A Kiss for My Prince, but they're still both good historical romance manga/manhwa's! (: