Isekai de Mofumofu Nadenade suru Tame ni Ganbattemasu.

Two isekai fantasies with smol kid MCs and fluffy animals. Their stories differ where Mofunade's MC is royalty whereas Iseyuru's MC are normal folks but there are equal parts cuteness and fun in both. Main difference is that the person who isekai'd in Mofunade turns into the child whereas Iseyuru has the person isekai'd into an adult but looks after two children. In turn, Mofunade's child is very independent with her past knowledge whereas childcare is a main theme in Iseyuru as the children still have the mind of children. Mofunade does get serious along the way in comparison but this is subject to change depending on how Iseyuru pans out. read more 

Woman in her 20's dies and reincarnates in an isekai with one desire. In Honzuki it was originally to read books and in Mofumofu it was to floof all the animals. 

Lots of fluffy cuteness. Low key, chill, relatively low stakes. Main difference is AMBL is more slice of life and a bit less serialized. Also, there's a romance angle in AMBL (by no means the defining aspect of the show), while Fluffy Paradise lacks any romance 

both are isekai and both MCs have the vision to befriend and empower all the monster races the differences are -one MC is child human and the other is a slime -slime isekai has combat and RPG mechanics in it 

both protagonist have the natural talent tame animals from the getgo. they get cuddly with veryquickly. the story are diffrent but the commonality is that of a talented animal tamer. 

While not too similar in terms of plot, both anime have a ton of cute animals, characters and situations, sure to make at least a few people melt from cuteness. 

S: Both MC reincarnate from Modern Japan Both MC have a cheat skill Both MC build their own group Both MC are reborn in an aristocrat family Both MC fight to improve their country/regions D: Isekai has female MC vs Tensei has male Isekai doesn’t involve war vs Tensei involves war Isekai is more cutesy vs Tensei is gritty and violent Isekai involves animals vs Tensei involves people 

Two fun and relaxing fantasies with serious moments and conflict here and there where the MCs were isekai'd into a child with some kind of ability relating to other creatures. MCs in both find peace in their new life, their skills in taming slimes in Kamihiro and befriending every animal in Mofunade is also very alike. With their skills being the highlight to what encounters they make, they would meet a variety of different people and become well liked by those around them along the way. 

Both anime are about cute little girls that makes you feel being cleansed from inside. 

Two reincarnation isekai anime with a cute female child protagonist who has a cute animal/monster companion. The way the two anime develop feels very similar, their setting is also alike, and anyone who likes cute stuff will surely find themselves very satisfied with both of these shows.