Takarajima, Ie Naki Ko Recommendations
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.