The Doraemon movies were originally made in 4:3, but they were shown in theaters in 16:9 and that's how they were primarily released. It's not always easy to find the 4:3 versions in good quality, though the 16:9 cropped versions can usually be found without too much effort.
[Anime Preservation] Movies in 4:3 cropped to 16:9
in Anime District
Posted
The Doraemon movies were originally made in 4:3, but they were shown in theaters in 16:9 and that's how they were primarily released. It's not always easy to find the 4:3 versions in good quality, though the 16:9 cropped versions can usually be found without too much effort.