What this means for learners
Moxo and Kapampangan share 17 sounds — roughly 68% of Kapampangan's inventory overlaps with Moxo. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 5 sounds found only in Kapampangan represent the greatest pronunciation challenge for Moxo 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, Moxo has 8 sounds not used in Kapampangan. Native Kapampangan speakers learning Moxo 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.