No. Donkey Kong Junior's appearance in the Donkey Kong Country games is not canon within the established Donkey Kong franchise timeline. Donkey Kong Junior is from a separate, earlier game series and his design and overall story differ significantly from the established lore and character designs of the Donkey Kong Country games. The Donkey Kong Country series features a different, older Donkey Kong and introduces Diddy Kong as his sidekick, a character absent from the Donkey Kong Junior games. While there might be thematic similarities or shared elements, the characters and their relationships are distinct, making a direct crossover non-canonical.