What this means for learners
Wik Mungkan and Kunjen share 7 sounds — roughly 25% of Kunjen's inventory overlaps with Wik Mungkan. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 21 sounds found only in Kunjen represent the greatest pronunciation challenge for Wik Mungkan speakers. The adult brain tends to map unfamiliar sounds onto the closest native equivalent — a process that produces the characteristic "accent" of a second-language speaker. Learning to hear and produce these sounds as distinct requires focused ear training, not just repetition.
Conversely, Wik Mungkan has 19 sounds not used in Kunjen. Native Kunjen speakers learning Wik Mungkan will face the mirror-image challenge with these sounds.
Phoneme inventories from PHOIBLE. Data reflects one documented inventory per language; some variation exists across dialects and sources.