Both stories are bildungsroman tales about young boys who are forced to set out on a character-building journey. The reasons for starting the journeyin both stories are similar but the circumstances of the boys differ slightly. Throughout the journey these boys meet many lovely people and many evil people and are initiated into adulthood through a wide range of joyful and sad experiences.
The original novel Nobody's Girl was the spiritual successor to Nobody's Boy, and viewers of their respective anime series will find similarities as well. They are both fairly long series (51 and 53 episodes) from the 1970s, and have the same basic plots: heartwarming (sort of) orphan ends up going on a journey to find lost family and happiness. These often fun and cheerful shows are also full of tragedy and sadness (Remi more so than Perrine), and have honestly lovable characters that even those far older than the target audience will enjoy.
Both are stories originally from the same author and they share plenty of similarities. The progression of how the stories unfold is pretty comparable as well. Perrine is just a bit more cheerful, while Remi has a bit more dread, but they always know exactly when to turn things around for the best. Simply put liking one of these, you'll probably enjoy the other. And they also share the same wondrous composer.
Both show young children facing difficulty and turmoil, depicting the unforgivably harsh conditions and reality of the 19th century European peasantry. Flanders no Inu (Belgium) and Ie Naki Ko (France).
These two shows have the same heart at the core of it. Ie Naki Ko is definitely more tragic than Udon's upbeat nature, being about a young boy who's sold off to a traveling musician. But there still is an endearing father/son relationship in both between two people who, while they aren't related, are still family regardless. And this relationship is the central relationship in both shows.
Ie Naki Ko and Takarajima are both adaptations of Western novels in which a young boy leaves home and travels the world accompanied by a charismatic father figure and animal companions. They were made by a lot of the same people - e.g. director Dezaki Osamu, character designer Sugio Akino, and art director/background artist Kobayashi Shichiro - and released one year apart. The visual similarities are extensive and obvious.
As for differences, Takarajima is a pure adventure story, whereas Ie Naki Ko puts the emphasis on Dickensian drama.
If you like one of these shows, you're going to love the other. It's really as simple as that. Both are French novel adaptations flawlessly brought to life in anime form by director Osamu Dezaki. I could praise him endlessly but the entire staff for both shows deserves a medal or two. Both shows retain a very serious tone and can be pretty melodramatic, with RoV diving a bit more into romances whereas Remi is more of a somber adventure following his everyday life as he barely gets by. The art and music in both are very high quality if you're into old stuff (honestly look better than a handful of 80's shows I've seen). I'll just stop there though, simply enough these are absolute masterpieces from Dezaki. Must see for both.  read more
As in Ie Naki Ko Heidi is also an orphan child looking for a family that accepts her having the same hardships of living sometimes on her own and having to endure the life with strange people that don't understands her.
And is also based on a very good novel like many of anime made in those ages.
Epic stories based on classic literature. These two titles are directed by some of the biggest names in the anime industry and present a very similar feel of adventure, drama and exploration. Both anime are highly inspirational when it comes to traveling, showing us unique and vivid sceneries in countries such as Italy, Brazil, Argentina, France and others.