Do you mean that [p] and [p'] are allophones of the phoneme /p/?
According to the IPA chart, the symbol"'" refers to ejectives and the [p'] is a biliabial ejective (a non-pulmonic consonant), while [p] is a bilabial plosive (a pulmonic consonant). So they are two different phonemes, I think.
Then add some water again and boil for thirty minutes
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